refactor: reorganize backend module boundaries

app/chain/recommend.py

@@ -7,18 +7,18 @@ from app.chain.bangumi import BangumiChain
 from app.chain.douban import DoubanChain
 from app.chain.listenbrainz import ListenBrainzChain
 from app.chain.tmdb import TmdbChain
-from app.platform.cache import cached, fresh
-from app.platform.config import settings, global_vars
+from app.runtime.cache import cached, fresh
+from app.runtime.config import settings, global_vars
 from app.domain.context import MusicInfo
-from app.services.image import ImageHelper
-from app.platform.log import logger
+from app.application.image import ImageHelper
+from app.runtime.log import logger
 from app.schemas import MediaType
 from app.schemas.types import (
     MUSIC_ENTITY_ALBUM,
     MUSIC_ENTITY_RECORDING,
     MediaSource,
 )
-from app.platform.execution import log_execution_time
+from app.runtime.execution import log_execution_time
 from app.domain.media import normalize_media_source
 from app.foundation.singleton import Singleton