fix(architecture): move media auxiliary mixin into _base package

media_auxiliary 作为模块共享 Mixin 放在 app/modules 顶层会被视为
业务模块，导致 anilist/bangumi/douban/imdb/themoviedb 跨模块直接
依赖，违反模块间禁止导入的架构约束。移入模块共享样板包
app/modules/_base（模块发现跳过）并同步依赖基线。

tests/fixtures/architecture/dependency-baseline.json

@@ -13,8 +13,8 @@
     "runtime_to_db": [],
     "workflow_to_db": []
   },
-  "edge_count": 6804,
-  "edge_sha256": "3e9a93795c6cfb5bc78e4871ae7c11b064ec0a2ea4f545ce94a6c0c696800df4",
+  "edge_count": 6809,
+  "edge_sha256": "0e5ab6c1e8d428de4edbc0ee162f17130143946c483967aaf49bca8c7c75b105",
   "edges": [
     "app -> app.runtime",
     "app -> app.runtime.compat",
@@ -4113,6 +4113,14 @@
     "app.modules._base.downloader -> app.runtime.log",
     "app.modules._base.downloader -> app.schemas",
     "app.modules._base.downloader -> app.schemas.types",
+    "app.modules._base.media_auxiliary -> app.domain",
+    "app.modules._base.media_auxiliary -> app.domain.context",
+    "app.modules._base.media_auxiliary -> app.domain.media",
+    "app.modules._base.media_auxiliary -> app.domain.meta",
+    "app.modules._base.media_auxiliary -> app.domain.meta.metabase",
+    "app.modules._base.media_auxiliary -> app.domain.metainfo",
+    "app.modules._base.media_auxiliary -> app.schemas",
+    "app.modules._base.media_auxiliary -> app.schemas.types",
     "app.modules._base.mediaserver -> app.application",
     "app.modules._base.mediaserver -> app.application.mediaserver",
     "app.modules._base.mediaserver -> app.domain",
@@ -4154,8 +4162,9 @@
     "app.modules.anilist -> app.domain.meta.metabase",
     "app.modules.anilist -> app.domain.scraper",
     "app.modules.anilist -> app.modules",
+    "app.modules.anilist -> app.modules._base",
+    "app.modules.anilist -> app.modules._base.media_auxiliary",
     "app.modules.anilist -> app.modules.anilist.anilist",
-    "app.modules.anilist -> app.modules.media_auxiliary",
     "app.modules.anilist -> app.runtime",
     "app.modules.anilist -> app.runtime.log",
     "app.modules.anilist -> app.runtime.settings",
@@ -4179,8 +4188,9 @@
     "app.modules.bangumi -> app.domain.meta.metabase",
     "app.modules.bangumi -> app.domain.scraper",
     "app.modules.bangumi -> app.modules",
+    "app.modules.bangumi -> app.modules._base",
+    "app.modules.bangumi -> app.modules._base.media_auxiliary",
     "app.modules.bangumi -> app.modules.bangumi.bangumi",
-    "app.modules.bangumi -> app.modules.media_auxiliary",
     "app.modules.bangumi -> app.runtime",
     "app.modules.bangumi -> app.runtime.log",
     "app.modules.bangumi -> app.runtime.settings",
@@ -4251,9 +4261,10 @@
     "app.modules.douban -> app.foundation",
     "app.modules.douban -> app.foundation.text",
     "app.modules.douban -> app.modules",
+    "app.modules.douban -> app.modules._base",
+    "app.modules.douban -> app.modules._base.media_auxiliary",
     "app.modules.douban -> app.modules.douban.apiv2",
     "app.modules.douban -> app.modules.douban.scraper",
-    "app.modules.douban -> app.modules.media_auxiliary",
     "app.modules.douban -> app.runtime",
     "app.modules.douban -> app.runtime.execution",
     "app.modules.douban -> app.runtime.log",
@@ -4548,8 +4559,9 @@
     "app.modules.imdb -> app.foundation",
     "app.modules.imdb -> app.foundation.text",
     "app.modules.imdb -> app.modules",
+    "app.modules.imdb -> app.modules._base",
+    "app.modules.imdb -> app.modules._base.media_auxiliary",
     "app.modules.imdb -> app.modules.imdb.api",
-    "app.modules.imdb -> app.modules.media_auxiliary",
     "app.modules.imdb -> app.runtime",
     "app.modules.imdb -> app.runtime.log",
     "app.modules.imdb -> app.runtime.settings",
@@ -4920,14 +4932,6 @@
     "app.modules.lrclib -> app.runtime.settings",
     "app.modules.lrclib -> app.schemas",
     "app.modules.lrclib -> app.schemas.types",
-    "app.modules.media_auxiliary -> app.domain",
-    "app.modules.media_auxiliary -> app.domain.context",
-    "app.modules.media_auxiliary -> app.domain.media",
-    "app.modules.media_auxiliary -> app.domain.meta",
-    "app.modules.media_auxiliary -> app.domain.meta.metabase",
-    "app.modules.media_auxiliary -> app.domain.metainfo",
-    "app.modules.media_auxiliary -> app.schemas",
-    "app.modules.media_auxiliary -> app.schemas.types",
     "app.modules.musicbrainz -> app.adapters",
     "app.modules.musicbrainz -> app.adapters.network",
     "app.modules.musicbrainz -> app.adapters.network.http",
@@ -5260,7 +5264,8 @@
     "app.modules.themoviedb -> app.foundation",
     "app.modules.themoviedb -> app.foundation.text",
     "app.modules.themoviedb -> app.modules",
-    "app.modules.themoviedb -> app.modules.media_auxiliary",
+    "app.modules.themoviedb -> app.modules._base",
+    "app.modules.themoviedb -> app.modules._base.media_auxiliary",
     "app.modules.themoviedb -> app.modules.themoviedb.category",
     "app.modules.themoviedb -> app.modules.themoviedb.scraper",
     "app.modules.themoviedb -> app.modules.themoviedb.tmdb_cache",
@@ -7320,6 +7325,7 @@
     "app.modules",
     "app.modules._base",
     "app.modules._base.downloader",
+    "app.modules._base.media_auxiliary",
     "app.modules._base.mediaserver",
     "app.modules._base.notification",
     "app.modules.acoustid",
@@ -7388,7 +7394,6 @@
     "app.modules.jellyfin.jellyfin",
     "app.modules.listenbrainz",
     "app.modules.lrclib",
-    "app.modules.media_auxiliary",
     "app.modules.musicbrainz",
     "app.modules.musicbrainz.music_cache",
     "app.modules.musixmatch",

tests/test_media_auxiliary.py

@@ -6,7 +6,7 @@ from unittest.mock import patch
 
 from app.chain.search import SearchChain
 from app.domain.context import MediaInfo
-from app.modules.media_auxiliary import MediaAuxiliaryProviderMixin
+from app.modules._base.media_auxiliary import MediaAuxiliaryProviderMixin
 from app.schemas.types import MediaSource, MediaType