perf: round 12 — auth write-path narrowing, fused quota gate, moka blob-cache index, media single-read, sized listing JSON

Benchmark-gated round (benches/ROUND12.md; every change ships with a
BEFORE/AFTER harness + equivalence gates, one candidate rejected by its
own bench):

DB / query shapes (bench_round12_queries):
- NC sharee search: username-only projection instead of the 21-column row
  (incl. the <=512 KiB avatar) per match, + gin_trgm_ops indexes on
  auth.users for the leading-wildcard ILIKE (4.98x; 54.7x with index).
- Password login: delete the redundant full-row update_user — create_session
  already stamps last_login_at in its own txn (4.45x per login).
- Email-verified stamp: narrow conditional UPDATE (8.9x); OIDC repeat login
  now compares profile state in memory and issues ZERO queries when nothing
  changed (was: full 17-column rewrite per login).
- Refresh rotation: revoke+insert+stamp fused into one transaction via new
  rotate_session port method (1.18x).
- WOPI CheckFileInfo / authorize_wopi_access: require(Read) + get_file +
  check(Update) overlapped with tokio::join!, original result precedence
  (cold 1.34x).
- Upload quota gate: user-envelope + drive-cap checks fused into ONE
  round-trip (check_upload_quotas) — the NC chunked PUT pays this per
  chunk (1.81x, 2 -> 1 queries/chunk); shared verdict evaluators keep
  error shapes byte-identical.

CPU / allocs (bench_round12_micro):
- sized_json: pre-sized listing serialization replacing axum Json's 128 B
  seed + doubling-realloc chain on files/folder-resources/photos/search
  responses (1.40x, 13 -> 2 allocs per 500-row page; byte-identical).
- Security headers: 4 SetResponseHeaderLayer folded into the CSP middleware
  pass (5 layers -> 1; 1.43x per request, -26 allocs; header set gated
  byte-identical incl. 304s).
- Media capture-metadata: single-read extraction — nom-exif now parses the
  buffer kamadak already read (zero-copy Bytes) and videos open once with a
  kind() dispatch; per-image opens 2-3 -> 1 (1.44x warm geomean, 1.6-3.2x
  cold cache; extraction outputs gated identical incl. the MIME-mislabel
  track fallback).
- Chunked-upload session ops: owner gate folded into the operation's own
  DashMap lookup + stack-encoded uuid compare (5 -> 3 lookups, -2 allocs,
  1.28x per chunk).

Blob cache (bench_blob_cache_index + round-3 regression guard):
- CachedBlobBackend index: tokio::sync::Mutex<LruCache> -> moka::sync::Cache
  with byte weigher. The mutex serialized every cached chunk read and scaled
  NEGATIVELY (2.08 -> 1.07 Mops/s from 1 -> 2 readers); moka probes are
  lock-free (2.17x at K=2). Byte budget now enforced by moka (manual
  current_size + collect_evictions machinery deleted); eviction listener
  unlinks size-evicted files only (Replaced entries keep their file —
  gated). Single-flight miss gate unchanged (16 concurrent misses -> 1
  fetch re-verified via the round-3 harness).
- put_blob now populates the cache BEFORE the inner backend consumes the
  source file (the old order failed 100% of the time — local renames,
  S3/Azure delete the source — so the first read after a whole-file put
  re-downloaded from the remote); inner-put failure invalidates the entry.

Frontend (vitest gates):
- List-view thumbnails request the 150px icon rendition instead of 400px
  preview into a 40px slot (~7.1x fewer pixels, ~4-5x fewer bytes per
  thumbnail across list views); grid keeps preview.

Rejected by its own bench (kept as evidence in bench_round12_micro §2):
- Single-pass compression predicate: the monomorphized And-chain already
  costs ~4.6 ns / 0 allocs total; the fused node measured within noise.

New migration: 20260719000000_users_search_trgm.sql (trgm indexes).
Deferred with prepared design: grouped file/grid view virtualization
(single-VirtualRows flatten, the photos pattern) — next round's headline.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BfidAJD5AHw23jtvBUNamB

src/application/ports/auth_ports.rs

@@ -131,6 +131,37 @@ pub trait UserStoragePort: Send + Sync + 'static {
         include_external: bool,
     ) -> Result<Vec<User>, DomainError>;
 
+    /// Username-only projection of [`search_users`] — same WHERE / ORDER /
+    /// LIMIT semantics, but skips hydrating the 21-column row (incl. the
+    /// up-to-512 KiB avatar `image`) when the caller only needs handles.
+    /// Rows whose username is NULL are returned as `None` so callers can
+    /// keep the wide flow's post-limit filtering semantics.
+    async fn search_usernames(
+        &self,
+        query: &str,
+        limit: i64,
+        include_external: bool,
+    ) -> Result<Vec<Option<String>>, DomainError>;
+
+    /// Stamps `email_verified_at = NOW()` iff it is still NULL (idempotent,
+    /// preserves the first timestamp — the SQL twin of
+    /// `User::mark_email_verified`). Narrow single-column write; avoids the
+    /// full-row [`update_user`] (incl. the avatar `image`) on the
+    /// magic-link redemption path.
+    async fn mark_email_verified(&self, user_id: Uuid) -> Result<(), DomainError>;
+
+    /// OIDC repeat-login profile sync: persists the IdP-provided avatar and
+    /// stamps `email_verified_at` (guarded, idempotent) in ONE narrow
+    /// statement. The `IS DISTINCT FROM` guard makes the common case (same
+    /// avatar, already verified) a zero-write no-op — vs the full 17-column
+    /// row rewrite this path used to pay per login. `last_login_at` is NOT
+    /// touched here: session creation stamps it, as on every login path.
+    async fn sync_oidc_login_profile(
+        &self,
+        user_id: Uuid,
+        image: Option<&str>,
+    ) -> Result<(), DomainError>;
+
     /// Lists users by role (e.g., "admin" or "user")
     async fn list_users_by_role(&self, role: &str) -> Result<Vec<User>, DomainError>;
 
@@ -239,6 +270,16 @@ pub trait SessionStoragePort: Send + Sync + 'static {
     /// Creates a new session
     async fn create_session(&self, session: Session) -> Result<Session, DomainError>;
 
+    /// Refresh-token rotation: revokes `old_session_id` and creates
+    /// `new_session` in ONE transaction (the refresh path used to pay two
+    /// full BEGIN/COMMIT round-trip pairs per rotation). Also stamps the
+    /// user's `last_login_at` exactly like [`create_session`] does.
+    async fn rotate_session(
+        &self,
+        old_session_id: Uuid,
+        new_session: Session,
+    ) -> Result<Session, DomainError>;
+
     /// Gets a session by refresh token
     async fn get_session_by_refresh_token(
         &self,