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/src/policy.ts

@@ -72,6 +72,8 @@ export const Subscription = EntityBase.extend({
   statusReason: z.string().nullable(),
   lastCheckedAt: Timestamp.nullable(),
   createdBy: z.string().nullable(),
+  /** 派生字段(列表返回):作品标题,未建档时为 null */
+  mediaEntityTitle: z.string().nullable().optional(),
 });
 export type Subscription = z.infer<typeof Subscription>;
 export const SubscriptionCreate = Subscription.pick({
@@ -145,6 +147,18 @@ export const AcquisitionSlot = EntityBase.extend({
   lastEvaluatedAt: Timestamp.nullable(),
   nextEvaluateAt: Timestamp.nullable(),
   revision: z.number().int().min(1),
+  /** 派生字段(列表返回):当前资产的交付特征摘要,无资产为 null */
+  currentAsset: z
+    .object({
+      id: Id,
+      resolution: z.string().nullable(),
+      sourceType: z.string().nullable(),
+      releaseGroup: z.string().nullable(),
+      sizeBytes: z.number().int().nullable(),
+      status: z.string(),
+    })
+    .nullable()
+    .optional(),
 });
 export type AcquisitionSlot = z.infer<typeof AcquisitionSlot>;
 export const AcquisitionSlotCreate = AcquisitionSlot.pick({
@@ -206,6 +220,55 @@ export const PreferenceTag = EntityBase.extend({
   policyRevisionId: Id.nullable(),
 });
 export type PreferenceTag = z.infer<typeof PreferenceTag>;
+
+/** 偏好标签修订历史:取自 audit_event(target_type=preference_tag),新→旧 */
+export const PreferenceTagRevision = z.object({
+  /** audit_event id */
+  id: Id,
+  at: Timestamp,
+  action: z.enum(["created", "updated", "deleted"]),
+  actorType: z.string(),
+  actorId: z.string().nullable(),
+  /** 该次写入后的 revision */
+  revision: z.number().int().min(1).nullable(),
+  /** 本次改动的字段(created/deleted 为空) */
+  changedFields: z.array(z.string()),
+  /** 写入后的快照 */
+  snapshot: z.object({
+    label: z.string(),
+    kind: z.string(),
+    status: z.string(),
+    scope: JsonObject,
+    rule: JsonObject,
+    description: z.string().nullable(),
+  }),
+});
+export type PreferenceTagRevision = z.infer<typeof PreferenceTagRevision>;
+export const PreferenceTagRevisionList = z.object({ items: z.array(PreferenceTagRevision) });
+export type PreferenceTagRevisionList = z.infer<typeof PreferenceTagRevisionList>;
+
+/** 策略预览结果(policy_revision.preview):最近 200 条来源资源按模板回放 */
+export const PolicyPreviewSummary = z.object({
+  evaluatedAt: z.string(),
+  sampleSize: z.number(),
+  templates: z.number(),
+  matched: z.number(),
+  excluded: z.number(),
+  samples: z.array(
+    z.object({
+      sourceReleaseId: z.string(),
+      /** 资源标题(W4 起提供) */
+      title: z.string().optional(),
+      sizeBytes: z.number().nullable().optional(),
+      template: z.string(),
+      decision: z.string(),
+      /** 拒绝/接受理由摘要 */
+      reasons: z.array(z.string()).optional(),
+    }),
+  ),
+  valid: z.boolean(),
+});
+export type PolicyPreviewSummary = z.infer<typeof PolicyPreviewSummary>;
 /** fingerprint 由服务端计算 */
 export const PreferenceTagCreate = PreferenceTag.pick({
   label: true,