feat(dl): add --animeapi and --enrich options for anime metadata and tagging

Add AnimeAPI integration to resolve anime database IDs (MAL, AniList, Kitsu, etc.) to TMDB/IMDB/TVDB for MKV tagging. The --enrich flag overrides show title and fills in year when missing from the service.

- Add animeapi-py dependency for cross-platform anime ID resolution
- Add --animeapi option (e.g. mal:12345, anilist:98765, defaults to MAL)
- Add --enrich flag to override title/year from external sources
- Remove --tmdb-name and --tmdb-year in favor of unified --enrich
- Update REST API params and docs to match

unshackle/core/api/download_manager.py

@@ -164,9 +164,9 @@ def _perform_download(
         "repack": params.get("repack", False),
         "tag": params.get("tag"),
         "tmdb_id": params.get("tmdb_id"),
-        "tmdb_name": params.get("tmdb_name", False),
-        "tmdb_year": params.get("tmdb_year", False),
         "imdb_id": params.get("imdb_id"),
+        "animeapi_id": params.get("animeapi_id"),
+        "enrich": params.get("enrich", False),
         "output_dir": Path(params["output_dir"]) if params.get("output_dir") else None,
         "no_cache": params.get("no_cache", False),
         "reset_cache": params.get("reset_cache", False),
@@ -180,9 +180,9 @@ def _perform_download(
         repack=params.get("repack", False),
         tag=params.get("tag"),
         tmdb_id=params.get("tmdb_id"),
-        tmdb_name=params.get("tmdb_name", False),
-        tmdb_year=params.get("tmdb_year", False),
         imdb_id=params.get("imdb_id"),
+        animeapi_id=params.get("animeapi_id"),
+        enrich=params.get("enrich", False),
         output_dir=Path(params["output_dir"]) if params.get("output_dir") else None,
     )
 

unshackle/core/api/routes.py

@@ -623,12 +623,12 @@ async def download(request: web.Request) -> web.Response:
               tmdb_id:
                 type: integer
                 description: Use this TMDB ID for tagging (default - None)
-              tmdb_name:
+              animeapi_id:
+                type: string
+                description: Anime database ID via AnimeAPI, e.g. mal:12345 (default - None)
+              enrich:
                 type: boolean
-                description: Rename titles using TMDB name (default - false)
-              tmdb_year:
-                type: boolean
-                description: Use release year from TMDB (default - false)
+                description: Override show title and year from external source (default - false)
               no_folder:
                 type: boolean
                 description: Disable folder creation for TV shows (default - false)