feat(server): W4-A integration endpoints and contract gaps

- POST /acquisition-plans: manual submit via download.plan -> download.submit
  (same authorization/audit/idempotency path as the agent), slotId or entityId
- read-only /media-assets, /asset-locations, /asset-unit-coverage, /path-bindings,
  /reconcile-runs, /server-mappings, /artifacts, GET /title-aliases/{id};
  unimplemented write endpoints removed from api.ts; registry test now checks both directions
- candidate evaluation upsert per (slot, source_release) + migration 0022 dedupe/unique index
- organization records expose downloadTaskId (+ list filter); inventory adds
  subscribed/candidateReasons; feed sources expose derived possibleGap
- GET /events?after=&limit= JSON replay page for API key callers (same sse_event table)
- preference tag revision history from audit_event; subscriptions/identities/aliases
  lists carry mediaEntityTitle; subscription q/mediaKind search; slot subscriptionId
  filter + currentAsset summary; policy preview samples carry title/reasons
- DecisionSummary, IdentityRevisionList, ReleaseIdentityResult, PolicyPreviewSummary exported from contracts

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/contracts/test/db-sync.test.ts

@@ -38,7 +38,7 @@ type Obj = z.ZodObject;
 /** 表(PascalCase)→ Row schema 与允许的差异 */
 const ROWS: Record<string, { row: Obj; dbOnly?: string[]; apiOnly?: string[] }> = {
   AcquisitionPlan: { row: C.AcquisitionPlan },
-  AcquisitionSlot: { row: C.AcquisitionSlot },
+  AcquisitionSlot: { row: C.AcquisitionSlot, apiOnly: ["currentAsset"] },
   AgentRun: { row: C.AgentRun },
   AgentRunEvent: { row: C.AgentRunEventRow },
   AgentRunMessage: { row: C.AgentRunMessage },
@@ -55,8 +55,8 @@ const ROWS: Record<string, { row: Obj; dbOnly?: string[]; apiOnly?: string[] }>
   Decision: { row: C.Decision },
   DownloadTask: { row: C.DownloadTask },
   DownloaderInstance: { row: C.DownloaderInstance },
-  ExternalIdentity: { row: C.ExternalIdentity },
-  FeedSource: { row: C.FeedSource },
+  ExternalIdentity: { row: C.ExternalIdentity, apiOnly: ["mediaEntityTitle"] },
+  FeedSource: { row: C.FeedSource, apiOnly: ["possibleGap"] },
   IdentityRevision: { row: C.IdentityRevision },
   LibraryRoot: { row: C.LibraryRoot },
   MediaAsset: { row: C.MediaAsset },
@@ -78,9 +78,9 @@ const ROWS: Record<string, { row: Obj; dbOnly?: string[]; apiOnly?: string[] }>
   Site: { row: C.Site },
   SiteAccount: { row: C.SiteAccount },
   SourceRelease: { row: C.SourceRelease },
-  Subscription: { row: C.Subscription },
+  Subscription: { row: C.Subscription, apiOnly: ["mediaEntityTitle"] },
   Task: { row: C.Task },
-  TitleAlias: { row: C.TitleAlias },
+  TitleAlias: { row: C.TitleAlias, apiOnly: ["mediaEntityTitle"] },
   // W2-B 来源/身份/元数据(0018–0020)
   FieldOverride: { row: C.FieldOverride },
   IdentityCandidate: { row: C.IdentityCandidate },