fix(frontend)+chore(deploy): 修复明细表格渲染 + static/ 改服务器构建

- SalesOrdersTab/PurchaseOrdersTab/MaterialsTab/ProductsTab: t-table 明细行不渲染（push/splice 改新数组引用）+ Decimal 算术类型错误（Number() 包裹）
- static/ 不再进 git（.gitignore），改为 deploy.sh 在服务器 npm run build
- 新增 deploy.sh：拉取 + 构建前端 + 重启后端

frontend/src/modules/inventory/components/MaterialsTab.vue

@@ -98,16 +98,16 @@ async function openRestockModal() {
 }
 
 function addRestockItem() {
-  restockItems.value.push({
+  restockItems.value = [...restockItems.value, {
     material_id: state.materials[0]?.id || null,
     quantity: 1,
     unit_price: 0,
     remark: ''
-  })
+  }]
 }
 
 function removeRestockItem(index: number) {
-  restockItems.value.splice(index, 1)
+  restockItems.value = restockItems.value.filter((_, i) => i !== index)
 }
 
 const restockTotalAmount = computed(() => {