feat(集数映射): 作品季集结构字段(迁移 0075)、剧集组接口契约与按 TMDB 默认季集换算

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Cxwgnn2pbzQ7rXv3rq7fei

packages/db/src/types.ts

@@ -952,6 +952,10 @@ export interface MediaEntityTable {
   created_at: GeneratedTimestamptz;
   updated_at: GeneratedTimestamptz;
   naming_override: Json | null;
+  episode_group_id: string | null;
+  episode_group_name: string | null;
+  episode_group_set_at: Timestamptz | null;
+  episode_group_set_by: string | null;
 }
 
 export interface MediaServerInstanceTable {