diff --git a/docs/STATUS.md b/docs/STATUS.md
index 033600c..f5783ee 100644
--- a/docs/STATUS.md
+++ b/docs/STATUS.md
@@ -4,6 +4,8 @@
 > 维护规则：每完整完成一个需求，**倒序在本文顶部加一条**（日期 + 主题 + 关键事实）；其余主文档（架构 / 规划 / 技术债 / 部署）维护各自的"当前有效说法"，本文只记录"什么时候做到了哪一步"。维护规则出处见根目录 [AGENTS.md](../AGENTS.md)。
 > 早期条目（2026-09-17 之前）已精简为锚点，完整流水见 [archive/2026-09_governance_batches.md](archive/2026-09_governance_batches.md) 与 [archive/2026-09_status_history.md](archive/2026-09_status_history.md)。
 
+> 2026-09-27（**分模方案预览契约修复：关键工艺参数面板整片 N/A + 备选方案预览无法切换**——多方案重构后 `cavity_data` 与可视化端的字段契约断裂，两处收口。① **legacy 契约桥接**：新增 `CalculationService.attach_scheme_info_contract`（[calculation_service.py](../src/moldinsight/services/calculation_service.py)），多方案规划器（[multi_scheme_planner.py](../src/moldinsight/core/multi_scheme_planner.py) `_build_scheme`）生成 `cavity_data` + `key_info` 后立即把方案级 `key_info` 内嵌回 `cavity_data`（`mold_cavities.cavity_key_info` + `cavity_count` + `manufacturing_info.mold_material / mold_hardness / surface_finish / estimated_cycle_time / parting_line_length`）——3D 预览"关键工艺参数"面板（[html_generator.py](../src/shared/utils/html_generator.py) `updateInfoPanel` / `updateSummaryPanels`）只拿得到 `cavity_data`，多方案重构后这些字段仅存在于 `scheme.key_info`，面板 10 项 8 项恒 N/A、前端结果页"型腔数"恒回退 1 腔（根因佐证：`_strip_heavy_geometry` 专门保留 `mold_cavities.cavity_key_info`，说明预览契约仍是 legacy 结构，多方案生成器未遵守）；② **方案级预览恢复**：[processing_service.py](../src/moldinsight/services/processing_service.py) `_attach_scheme_previews` 由"仅最优方案生成完整 HTML + 其余方案只生成 summary JSON（前端零消费死产物 `summary_file`，已删除）"改为**每方案生成完整预览**（HTML + `_summary.json` + `_data.json` 三件直传 RustFS 报告键）并写 `scheme["html_file"] = /html/{name}`——前端 ResultView 预览取 `selectedScheme?.html_file`，此前后端从不写方案级 `html_file`，切方案 iframe `:key` 不变，备选方案永远显示推荐方案预览；任务级 HTML 复用推荐方案预览不再重复生成（`save_html_file` 要求本地文件存在，`_attach_scheme_previews` 返回推荐方案预览本地路径，无任何方案 `cavity_data` 时回退任务级单份生成）；③ 前端 [ResultView.vue](../frontend/src/modules/moldinsight/ResultView.vue) 3D 预览标题栏加"当前：方案名" t-tag（多方案时渲染），切换有明确反馈。**已知取舍**：每方案预览复制一份网格数据 JSON，RustFS 报告键存储随方案数线性增长，换备选方案真实独立分模预览（存储吃紧时演进共享产品网格 + 方案差分，见 [TECH_DEBT.md](TECH_DEBT.md) D11 追记）。**历史任务不回填**：已入库任务缺字段与每方案预览文件，需重新分析才能看到完整参数与切换预览。**接口面零变化**（无路由/Pydantic schema 变更，`scheme.html_file` 为 `/api/status/{task_id}` 自由 dict 内新增字段，openapi.json 不触发重导出）。**测试基线**：**193 passed, 13 skipped**（净增 1：`test_calculation_service_bridges_scheme_info_contract`，OCC-free 直测契约桥接）；前端 `vue-tsc -b` 通过。**说明**：本地 pip 环境无 pythonocc，`multi_scheme_planner` 运行时路径未实跑（py_compile 通过；core→services import 模式与 `aluminum_foam_mold` 引 `MaterialService` 同款，无循环依赖），OCC 全量验证待 conda 环境补跑。）
+>
 > 2026-09-26（**端口默认值统一 10003 / 10004**：约定"容器内部端口无所谓，重要的是映射到宿主机的端口；前端页面 = 10003"。① [.env.example](../.env.example) 端口段重写：移除冗余的 `HOST` / `PORT`（uvicorn 命令硬编码，未读取）+ 移除误导性的"应用内部监听端口"注释；新增端口段约定（`FRONTEND_PORT=10003` 浏览器入口、`BACKEND_PORT=10003` 同端口供调试直连、`MOLDINSIGHT_PORT=10003` / `INVENTORY_PORT=10004` 独立模式）；② [docker-compose.yml](../docker-compose.yml) frontend 默认端口回退 `80→10003`、backend 默认 `8000→10003`、删除 backend service 内冗余的 `HOST/PORT` env（uvicorn `--host/--port` 已是单一事实源，env 无代码读）；③ [docker-compose.moldinsight.yml](../docker-compose.moldinsight.yml) / [docker-compose.inventory.yml](../docker-compose.inventory.yml) `MOLDINSIGHT_PORT/INVENTORY_PORT` 默认 `8000/8001→10003/10004`；④ [docs/deployment/DEPLOY_PORT.md](../docs/deployment/DEPLOY_PORT.md) §3 / [docs/deployment/PORT_CONFIG.md](../docs/deployment/PORT_CONFIG.md) §1 §2 端口映射示例同步。**验证**：yaml 渲染后端口映射 `[unified] frontend 10003→80 / backend 10003→8000`、`[moldinsight] 10003→8000`、`[inventory] 10004→8001`，与约定一致。**遗留**：服务器 `.env` 与新版 `.env.example` 对齐（已有字段名一致，仅注释差异，不需要重设值）。
 >
 > 2026-09-26（**Compose 拆分部署机端到端复验：3 个收尾修复 + 1 处文档澄清**——① `--workdir` 误用修复：[docker-compose.yml](../docker-compose.yml) / [docker-compose.moldinsight.yml](../docker-compose.moldinsight.yml) 中 `moldinsight-celery` 的 `command:` 原照搬旧 Dockerfile.celery 的 `celery worker --workdir=/app/src ...`，celery 5.x 已移除 `--workdir` 选项（部署机实测报 `No such option '--workdir'`），改为 `cd /app/src && exec celery -A celery_app worker ...`——celery_app.py 内 `include=["celery_tasks"]` 为裸模块名，必须在 `src/` 下启动 worker，与是否支持 `--workdir` 解耦，跨 celery 版本稳定；② **裸 `up` 不重建已有镜像**澄清：部署机复用旧 gemold-backend 镜像起容器（旧 miniconda base + 旧代码），`docker compose up -d` 仅在本地无同名镜像时构建，DEPLOYMENT §1.2 / README / OPERATIONS §4 / LINUX_SETUP §11 同步补一句"更新代码后须 `up -d --build` 或先 `docker compose build`"；③ build.sh 步骤由"四步（base→backend→celery→frontend）"修正为"三步（base→backend→frontend，celery 复用 backend 镜像）"——`Dockerfile.celery` 早已删除但 build.sh 与 README 的描述未跟改，三处文档统一收口。**遗留**：服务器 `docker compose up -d --build` 重建验证新 base + 新 celery 启动命令端到端可用。）
diff --git a/docs/TECH_DEBT.md b/docs/TECH_DEBT.md
index 1f701ff..e47b5d3 100644
--- a/docs/TECH_DEBT.md
+++ b/docs/TECH_DEBT.md
@@ -160,6 +160,7 @@
 - **读侧**：`/html` StaticFiles 挂载删除，新增代理路由 [html_report_router.py](../src/moldinsight/api/html_report_router.py)（挂根路径保持 URL 形状——持久化 cavity JSON 与前端 iframe 均引用 `/html/{filename}`）：RustFS 报告键直取 → 遗留 `html/{hash}.json` JSON 包装解析 → 本地卷存量兜底 → 404，防路径穿越（单段文件名校验）
 - **部署**：celery 服务摘除 `html_data` 卷（不再写本地）；Dockerfile.moldinsight 删除 `COPY html_output/`（构建机陈旧报告不再烤进镜像）
 - **已知约束**（沿用 StaticFiles 时代既定姿态，非新引入）：报告路由不做认证——iframe 无法携带 Authorization 头
+- **2026-09-27 追记**：可视化产物从"每任务一套"改为**每分模方案一套**——`_attach_scheme_previews` 为每个 `candidate_schemes` 生成独立 HTML / `_summary.json` / `_data.json`（[processing_service.py](../src/moldinsight/services/processing_service.py)），`scheme["html_file"]` 供前端切方案即切预览；任务级 HTML 复用推荐方案那份（`HTMLFile` 记录仍仅推荐方案一条）。**已知取舍**：网格数据 JSON 每方案复制一份，报告键存储随方案数线性增长（当前 ≤3 方案，接受）；存储吃紧时再演进共享产品网格 + 仅差分型腔/模芯，暂不排期
 - 回归测试：[tests/test_html_report_router.py](../tests/test_html_report_router.py)（8 例：四链路命中、新旧格式记录区分、媒体类型、404、穿越拒绝）
 
 ~~原现状 / 影响~~：可视化 HTML/摘要同时写本地与 RustFS，多副本下 /html 命中结果取决于负载均衡，跨副本文件不共享。
diff --git a/frontend/src/modules/moldinsight/ResultView.vue b/frontend/src/modules/moldinsight/ResultView.vue
index 2e65778..a43c0a9 100644
--- a/frontend/src/modules/moldinsight/ResultView.vue
+++ b/frontend/src/modules/moldinsight/ResultView.vue
@@ -151,6 +151,9 @@
         <div class="summary-header">
           <h3>3D 预览</h3>
           <t-tag theme="primary">重点区域</t-tag>
+          <t-tag v-if="candidateSchemes.length > 1" theme="warning" variant="light">
+            当前：{{ selectedScheme?.title || selectedScheme?.scheme_id }}
+          </t-tag>
         </div>
         <t-alert v-if="state.previewStatus === 'error'" theme="warning" title="预览加载失败" :message="'HTML 已生成但加载异常，请检查该链接是否可访问：' + selectedHtmlFile" style="margin-bottom: var(--space-3);" />
         <iframe
diff --git a/src/moldinsight/core/multi_scheme_planner.py b/src/moldinsight/core/multi_scheme_planner.py
index 975c82c..a39b995 100644
--- a/src/moldinsight/core/multi_scheme_planner.py
+++ b/src/moldinsight/core/multi_scheme_planner.py
@@ -11,6 +11,7 @@ from OCC.Core.TopoDS import TopoDS_Face, TopoDS_Shape, topods
 from moldinsight.core.mold_generator_registry import mold_generator_registry
 from moldinsight.core.parting_candidate_generator import PartingCandidateGenerator
 from moldinsight.core.parting_scheme_scorer import PartingSchemeScorer
+from moldinsight.services.calculation_service import CalculationService
 from shared.utils.logger import get_logger
 
 logger = get_logger(__name__)
@@ -149,6 +150,9 @@ class MultiSchemeMoldPlanner:
 
         cavity_data = generator.generate_detailed_cavity_json(cavity_result)
         key_info = generator.generate_cavity_key_info(cavity_result)
+        # 桥接 legacy 契约：3D 预览面板/前端只读 cavity_data 内嵌字段，
+        # key_info 不内嵌回去则"关键工艺参数"整片 N/A（见 attach_scheme_info_contract）
+        CalculationService.attach_scheme_info_contract(cavity_data, key_info)
         cavity_data.setdefault("metadata", {})
         cavity_data["metadata"]["scheme_id"] = candidate["scheme_id"]
         cavity_data["metadata"]["scheme_method"] = candidate["method"]
diff --git a/src/moldinsight/services/calculation_service.py b/src/moldinsight/services/calculation_service.py
index 5f4e5b4..71e8687 100644
--- a/src/moldinsight/services/calculation_service.py
+++ b/src/moldinsight/services/calculation_service.py
@@ -364,6 +364,33 @@ class CalculationService:
         cls.attach_injection_system_summaries(result, material["name"])
         return result
 
+    @staticmethod
+    def attach_scheme_info_contract(cavity_data: Dict[str, Any], key_info: Dict[str, Any]) -> None:
+        """把方案级 key_info 内嵌回 cavity_data，补齐下游依赖的 legacy 字段契约（原地修改）。
+
+        3D 预览 HTML（shared/utils/html_generator 的"关键工艺参数"面板）只拿得到 cavity_data：
+        - 面板读 mold_cavities.cavity_key_info.geometric_characteristics 与
+          manufacturing_info.mold_material / mold_hardness / surface_finish /
+          estimated_cycle_time / parting_line_length；
+        - 前端结果页"型腔数"读 mold_cavities.cavity_count。
+        多方案重构后这些字段只存在于 scheme.key_info，缺失会导致面板整片 N/A——在此统一桥接。
+        """
+        mold_cavities = cavity_data.setdefault("mold_cavities", {})
+        mold_cavities.setdefault("cavity_count", 1)
+        mold_cavities["cavity_key_info"] = key_info
+
+        requirements = key_info.get("manufacturing_requirements", {})
+        mold_parameters = key_info.get("mold_parameters", {})
+        manufacturing = cavity_data.setdefault("manufacturing_info", {})
+        manufacturing.setdefault(
+            "mold_material",
+            requirements.get("cavity_material") or manufacturing.get("recommended_material", ""),
+        )
+        manufacturing.setdefault("mold_hardness", requirements.get("hardness", ""))
+        manufacturing.setdefault("surface_finish", requirements.get("surface_finish", ""))
+        manufacturing.setdefault("estimated_cycle_time", requirements.get("estimated_cycle_time", ""))
+        manufacturing.setdefault("parting_line_length", mold_parameters.get("parting_line_length", ""))
+
     @classmethod
     def attach_injection_system_summaries(
         cls,
diff --git a/src/moldinsight/services/processing_service.py b/src/moldinsight/services/processing_service.py
index 463d973..f54cac9 100644
--- a/src/moldinsight/services/processing_service.py
+++ b/src/moldinsight/services/processing_service.py
@@ -316,7 +316,7 @@ class ProcessingService:
             try:
                 html_generator = HTMLGenerator(output_dir=str(html_out_dir))
 
-                detailed_cavity_json = await self._attach_scheme_previews(
+                detailed_cavity_json, best_html_local = await self._attach_scheme_previews(
                     detailed_cavity_json=detailed_cavity_json,
                     geometry_data=geometry_data,
                     stp_filename=Path(file_path).name,
@@ -329,26 +329,37 @@ class ProcessingService:
                 best_cavity_data = best_scheme.get("cavity_data", {}) if best_scheme else best_cavity_data
                 best_key_info = best_scheme.get("key_info", {}) if best_scheme else best_key_info
 
-                # 8. 保存模具型腔数据（包含方案级预览链接）
+                # 8. 保存模具型腔数据（包含方案级 html_file 预览链接）
                 await self.analysis_storage.save_mold_cavity_data(
                     db_session, stp_file_id, detailed_cavity_json
                 )
 
-                html_file_path = html_generator.generate_and_save_visualization(
-                    geometry_data,
-                    Path(file_path).name,
-                    cavity_data=best_cavity_data,
-                    pointcloud_data=pointcloud_data,
-                    lod_data=lod_data,
-                )
-                await self._upload_report_artifacts(Path(html_file_path))
+                # 任务级 HTML 复用推荐方案预览（各方案已生成并上传，不再重复生成）
+                if best_html_local:
+                    await self.analysis_storage.save_html_file(
+                        db_session,
+                        stp_file_id,
+                        Path(best_html_local).name,
+                        best_html_local,
+                    )
+                else:
+                    # 兜底：候选方案均无 cavity_data 时退回任务级单份生成
+                    logger.warning("未生成任何方案级预览，回退任务级单份可视化")
+                    html_file_path = html_generator.generate_and_save_visualization(
+                        geometry_data,
+                        Path(file_path).name,
+                        cavity_data=best_cavity_data,
+                        pointcloud_data=pointcloud_data,
+                        lod_data=lod_data,
+                    )
+                    await self._upload_report_artifacts(Path(html_file_path))
 
-                await self.analysis_storage.save_html_file(
-                    db_session,
-                    stp_file_id,
-                    Path(html_file_path).name,
-                    html_file_path,
-                )
+                    await self.analysis_storage.save_html_file(
+                        db_session,
+                        stp_file_id,
+                        Path(html_file_path).name,
+                        html_file_path,
+                    )
             finally:
                 shutil.rmtree(html_out_dir, ignore_errors=True)
             stage_timings["persist_artifacts"] = round(time.perf_counter() - stage_started, 3)
@@ -443,7 +454,7 @@ class ProcessingService:
                 "material": requested_material,
                 "parameters": process_params,
                 "stage_timings": stage_timings,
-                "html_file": best_scheme.get("html_file", f"/html/{Path(html_file_path).name}") if best_scheme else f"/html/{Path(html_file_path).name}",
+                "html_file": (best_scheme or {}).get("html_file") or "",
                 "verification": verification_result,
                 "llm_report": llm_report,
                 "export_artifacts": export_artifacts,
@@ -723,40 +734,49 @@ class ProcessingService:
         pointcloud_data: Optional[Dict[str, Any]] = None,
         lod_data: Optional[Dict[str, Any]] = None,
         html_generator: HTMLGenerator = None,
-    ) -> Dict[str, Any]:
-        """为候选分模方案生成轻量摘要链接（完整HTML仅最优方案按需生成）"""
+    ) -> Tuple[Dict[str, Any], Optional[str]]:
+        """为每个候选分模方案生成独立 3D 预览（HTML + 摘要/数据 JSON 直传 RustFS）。
+
+        前端结果页切方案即切预览，依赖方案级 scheme["html_file"]=/html/{name}；
+        只给最优方案生成单份 HTML（旧逻辑）会让备选方案永远显示推荐方案预览。
+
+        返回 (detailed_cavity_json, 推荐方案预览的本地路径)：
+        本地路径供 save_html_file 落 HTMLFile 记录（读侧要求本地文件存在），
+        任务级 html_file 直接复用推荐方案预览，不再重复生成。
+        """
         if html_generator is None:
             raise ValueError(
-                "html_generator 不能为空（D11：摘要产物统一经任务临时目录上传 RustFS）"
+                "html_generator 不能为空（D11：可视化产物统一经任务临时目录上传 RustFS）"
             )
         candidate_schemes = detailed_cavity_json.get("candidate_schemes", [])
         if not candidate_schemes:
-            return detailed_cavity_json
+            return detailed_cavity_json, None
+
+        best_scheme = CalculationService.get_best_scheme(detailed_cavity_json)
+        best_html_local: Optional[str] = None
 
         for scheme in candidate_schemes:
             cavity_data = scheme.get("cavity_data")
             if not cavity_data:
                 continue
-            suffix = scheme.get("scheme_id")
-            base_stem = Path(stp_filename).stem.replace(" ", "_")
-            ts = datetime.now().strftime("%Y%m%d_%H%M%S")
-            summary_name = f"mold_{base_stem}_{suffix}_{ts}_summary.json"
-            summary_content = html_generator.generate_3d_viewer_summary(
-                geometry_data, cavity_data
+            suffix = str(scheme.get("scheme_id") or Path(stp_filename).stem)
+            html_file_path = html_generator.generate_and_save_visualization(
+                geometry_data,
+                Path(stp_filename).name,
+                cavity_data=cavity_data,
+                pointcloud_data=pointcloud_data,
+                lod_data=lod_data,
+                suffix=suffix,
             )
-            # D11：摘要 JSON 写任务临时目录后直传 RustFS 报告键，不落本地 html_output
-            summary_path = html_generator.save_data_file(summary_content, summary_name)
-            await rustfs_manager.upload_report_artifact(
-                summary_name, Path(summary_path).read_bytes(),
-                content_type="application/json",
-            )
-            scheme["summary_file"] = f"/html/{summary_name}"
+            await self._upload_report_artifacts(Path(html_file_path))
+            scheme["html_file"] = f"/html/{Path(html_file_path).name}"
+            if best_scheme and scheme.get("scheme_id") == best_scheme.get("scheme_id"):
+                best_html_local = html_file_path
 
-        best_scheme = CalculationService.get_best_scheme(detailed_cavity_json)
         if best_scheme:
             detailed_cavity_json["html_file"] = best_scheme.get("html_file")
 
-        return detailed_cavity_json
+        return detailed_cavity_json, best_html_local
 
     async def _upload_report_artifacts(self, html_file_path: Path):
         """D11：任务临时目录中的可视化产物（.html / _summary.json / _data.json）
diff --git a/tests/test_moldinsight_regressions.py b/tests/test_moldinsight_regressions.py
index 2bdcb56..26a1e31 100644
--- a/tests/test_moldinsight_regressions.py
+++ b/tests/test_moldinsight_regressions.py
@@ -78,6 +78,52 @@ def test_calculation_service_attaches_injection_system_summary():
     assert "injection_system" in result
 
 
+def test_calculation_service_bridges_scheme_info_contract():
+    """多方案 cavity_data 必须自包含可视化面板依赖的 legacy 字段。
+
+    3D 预览"关键工艺参数"面板只拿得到 cavity_data；key_info 不内嵌回去则
+    面板整片 N/A、前端型腔数恒为 1（2026-09 事故根因）。
+    """
+    key_info = {
+        "mold_parameters": {
+            "shrinkage_rate": "0.50%",
+            "draft_angle": "2.0°",
+            "parting_line_length": 620.0,
+        },
+        "geometric_characteristics": {
+            "product_volume": "12.00 cm³",
+            "product_weight": "12.60 g",
+            "wall_thickness_range": "1.40 - 2.60 mm",
+        },
+        "manufacturing_requirements": {
+            "cavity_material": "P20钢材",
+            "hardness": "HRC 28-32",
+            "surface_finish": "SPI A2",
+            "estimated_cycle_time": "25 秒",
+        },
+    }
+    cavity_data = {
+        "metadata": {"shrinkage_rate": 0.005, "draft_angle": 2.0},
+        "manufacturing_info": {"recommended_material": "P20钢材"},
+        "mold_cavities": {"cavity": {"vertex_count": 1}, "core": {"vertex_count": 1}},
+    }
+
+    CalculationService.attach_scheme_info_contract(cavity_data, key_info)
+
+    mold_cavities = cavity_data["mold_cavities"]
+    assert mold_cavities["cavity_count"] == 1
+    assert (
+        mold_cavities["cavity_key_info"]["geometric_characteristics"]["product_volume"]
+        == "12.00 cm³"
+    )
+    manufacturing = cavity_data["manufacturing_info"]
+    assert manufacturing["mold_material"] == "P20钢材"
+    assert manufacturing["mold_hardness"] == "HRC 28-32"
+    assert manufacturing["surface_finish"] == "SPI A2"
+    assert manufacturing["estimated_cycle_time"] == "25 秒"
+    assert manufacturing["parting_line_length"] == 620.0
+
+
 def test_material_service_falls_back_to_abs_for_unknown_material():
     material = MaterialService.get_material("UNKNOWN")
     assert material["name"] == "ABS"