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/assets.ts

@@ -19,6 +19,16 @@ export const DeliveryTraits = z.object({
   sourceType: z.string().optional(),
   releaseGroup: z.string().optional(),
   subtitles: z.array(z.string()).optional(),
+  // LIBV-1 版本规格(domain deliveryOfSpec 写入;specVersion 标记口径,缺省 = 旧数据待回填)
+  specVersion: z.number().int().optional(),
+  specFrom: z.array(z.enum(["name", "probe"])).optional(),
+  isEncode: z.boolean().optional(),
+  bitDepth: z.number().int().optional(),
+  audio: z
+    .array(z.object({ codec: z.string().optional(), channels: z.string().optional(), language: z.string().optional() }))
+    .optional(),
+  edition: z.string().optional(),
+  durationSec: z.number().int().optional(),
 });
 export type DeliveryTraits = z.infer<typeof DeliveryTraits>;