feat(library): show stored versions per episode and movie (LIBV-1)

- domain versionSpecOf: file name + ffprobe + ingest quality -> version spec;
  summarizeVersions; matchVersions (satisfied / missing / upgradeable, single target)
- GET /library/{id}/versions: per-season/episode versions, summaries, matches[]
- organize writes full spec into media_asset.delivery (specVersion 1)
- scripts/asset-spec-backfill.ts: dry-run by default, --probe local only, --apply
- web: season summary line, one-line spec per episode, N versions expand,
  tech info details (TODO: DEAI-2 TechInfo), movie versions panel

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

packages/contracts/src/api.ts

@@ -13,6 +13,7 @@ import * as execution from "./execution.ts";
 import * as files from "./files.ts";
 import * as identity from "./identity.ts";
 import * as instances from "./instances.ts";
+import * as libraryVersions from "./library-versions.ts";
 import * as mcp from "./mcp.ts";
 import * as ops from "./ops.ts";
 import * as organization from "./organization.ts";
@@ -2181,6 +2182,15 @@ export const Api = {
       params: IdParam,
       response: organization.LibraryDetail,
     }),
+    versions: ep({
+      method: "get",
+      path: "/library/{id}/versions",
+      scope: "read",
+      summary: "作品的入库版本：每季每集的本地文件版本与规格、季 / 作品汇总、与版本目标的比对",
+      params: IdParam,
+      query: libraryVersions.LibraryVersionsQuery,
+      response: libraryVersions.LibraryVersions,
+    }),
     reconcile: ep({
       method: "post",
       path: "/library/reconcile",