feat(ao,sources): W5-C subscription completion, Slot × unit reservation, deferral, pack file selection, active search

- completion by season episode_total ledger (applySlotEvent verify_passed hook overrides organize's
  complete): unknown total keeps tracking and records suspected-missing; pending never completes;
  once / continuous current-season completion writes subscription_history
- evaluation: missing = release units ∩ episodeRange − covered − in-flight; series slots may hold
  several unit-disjoint in-flight plans; overlapping/busy releases are deferred (slot_deferral) and
  re-evaluated when a plan ends (next_evaluate_at due) or on the periodic slot re-evaluation
- per-unit upgrade via slot_unit ledger; site scope (params.siteIds); site facts in evaluation context
- season packs: after submit read qB files and setFilePriority(0) for covered/in-flight episodes;
  whole pack with recorded reason when undeterminable; removed downloads release their reservation
- searchSubscription task (title/aliases × enabled sites via liveSearch, snapshot + rate limiter):
  on create, every searchIntervalHours (default 24h) and POST /subscriptions/{id}/search
- refreshMetadata writes season totals (only grows, floored by covered, lock respected) and turns
  metadata_pending subscriptions active; plan loop refreshes tracked series every 6h
- endpoints: subscription progress, episode-total, subscription-history; e9 continuous-series e2e

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

apps/server/test/sources-identity/mteam-tasks.test.ts

@@ -72,7 +72,13 @@ describe.skipIf(!up)("M-Team 快照与任务注册", () => {
   it("模块注册 4 个任务与 3 条 outbox 路由;任务处理器经 step.run 调服务", async () => {
     const reg = new TaskRegistry();
     h.module.registerTasks(reg, h.ctx);
-    expect(reg.names()).toEqual(["ingestFeed", "refreshMetadata", "resolveObservation", "snapshotSite"]);
+    expect(reg.names()).toEqual([
+      "ingestFeed",
+      "refreshMetadata",
+      "resolveObservation",
+      "searchSubscription",
+      "snapshotSite",
+    ]);
     expect(Object.keys(h.module.outboxRoutes!(h.ctx)).sort()).toEqual([
       "feed.due",
       "feed.gap_suspected",