feat(contracts,db): naming settings, override fields and template versions (0032)

- settings.naming {movie, tv, variety, lockFileNameForBound}, default = MP templates;
  library section gains #naming anchor
- naming API schemas and Api.naming endpoints (variables, preview, templates, overrides)
- 0032: library_root.naming, media_entity.naming_override, naming_template_version
  (version 1 = upgraded v1 templates, 2 = MP default, fingerprint-deduplicated)

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

packages/contracts/src/content.ts

@@ -23,6 +23,8 @@ export const MediaEntity = EntityBase.extend({
   /** 人工锁定的字段名;刷新不得覆盖 */
   fieldLocks: z.array(z.string()),
   lastMetadataRefreshAt: Timestamp.nullable(),
+  /** 作品级命名模板覆盖 {movie?, tv?, variety?}(见 settings NamingOverride);null = 不覆盖。经 PUT /media-entities/{id}/naming-override 修改 */
+  namingOverride: JsonObject.nullable().optional(),
 });
 export type MediaEntity = z.infer<typeof MediaEntity>;
 export const MediaEntityCreate = MediaEntity.pick({