fix(music): 原声带电影名本体检索与合辑前缀拆分修复零命中

- musicbrainz: 原声带描述词（Original Motion Picture Soundtrack）剔除后
  用电影名本体补充检索阶梯，候选比对支持本体与主标题弱匹配；
  后缀定界防止 Ghost 类词内 ost 误剥，本体过短时不作独立检索目标
- musicbrainz: 尾部年份反复剥离，修复场景命名重复携带年份
  （Live At Montreux 2011 2011）阻断精确匹配
- metamusic: Various Artists-Title 全拼合辑前缀拆分，未收录别名变体
  统一归一为 Various Artists
- 补充原声带/重复年份/合辑前缀测试案例

app/core/meta/metamusic.py

@@ -251,10 +251,10 @@ _MUSIC_DATE_PREFIX_RE = re.compile(
 _MUSIC_ARTIST_SEPARATOR_RE = re.compile(r"\s*(?:&|,|，|、|/)\s*")
 # 合辑资源的 Various Artists 署名别名：VA 是场景命名常用缩写，
 # 归一为 MusicBrainz 规范署名 Various Artists 才能命中合辑条目
-_MUSIC_ARTIST_ALIASES = {"va": "Various Artists"}
-# VA-Title 无空格连字符前缀写法（场景命名），主拆分不适用需单独处理
+_MUSIC_ARTIST_ALIASES = {"va": "Various Artists", "various artists": "Various Artists"}
+# VA-Title / Various Artists-Title 无空格连字符前缀写法（场景命名），主拆分不适用需单独处理
 _MUSIC_ALIAS_PREFIX_RE = re.compile(
-    r"^\s*(?P<alias>VA)\s*[-–—−－]\s*(?P<title>.+\S)\s*$",
+    r"^\s*(?P<alias>VA|Various\.?\s*Artists)\s*[-–—−－]\s*(?P<title>.+\S)\s*$",
     re.IGNORECASE,
 )
 # 艺术家与曲名的主分隔：半角/全角空格包裹的连字符（- – — − －）
@@ -566,7 +566,9 @@ class MetaMusic(MetaBase):
             # 场景命名的 VA-Title 无空格连字符写法，主拆分不适用，按别名前缀单独拆分
             alias_match = None if self.artists else _MUSIC_ALIAS_PREFIX_RE.match(cleaned)
             if alias_match:
-                self.artists = [_MUSIC_ARTIST_ALIASES[alias_match.group("alias").casefold()]]
+                # 别名前缀均为合辑署名写法，未收录变体统一归一为 Various Artists
+                self.artists = [_MUSIC_ARTIST_ALIASES.get(
+                    alias_match.group("alias").casefold(), "Various Artists")]
                 self._finalize_title(self._clean_tail(alias_match.group("title")))
             else:
                 # CJK 标题常见「专辑名-歌手」无空格连字符写法，主拆分未命中时兑底反向拆分

app/modules/musicbrainz/__init__.py

@@ -200,6 +200,23 @@ class MusicBrainzModule(_ModuleBase):
         """剔除标题尾部的卷号后缀，返回专辑本体名。"""
         return cls._normalize_text(cls._VOLUME_SUFFIX_RE.sub("", str(value or "")))
 
+    # 原声带资源标题的通用描述词尾部（条目本体是电影名）；
+    # 尾部描述词保留时作为原声带形态标记参与弱匹配判定
+    _SOUNDTRACK_SUFFIX_RE = re.compile(
+        r"\s*(?:original\s+motion\s+picture|motion\s+picture)?\s*"
+        r"(?<![A-Za-z0-9])(?:original\s+)?(?:soundtrack|score|ost)$",
+        re.IGNORECASE,
+    )
+
+    @classmethod
+    def _soundtrack_body(cls, value: Optional[str]) -> str:
+        """剔除原声带标题尾部的通用描述词，返回电影名本体；无描述词返回空串。"""
+        text = str(value or "").strip()
+        body = cls._SOUNDTRACK_SUFFIX_RE.sub("", text)
+        if not body or body == text:
+            return ""
+        return cls._normalize_text(body)
+
     # 演唱会资源的标题常带演出后缀（S.H.E十七音乐会），条目仅保留演出名本体
     _PERFORMANCE_SUFFIX_RE = re.compile(
         r"\s*(?:音乐会|音樂會|演唱会|演唱會|巡回|巡演|Live|Tour)$", re.IGNORECASE)
@@ -261,6 +278,12 @@ class MusicBrainzModule(_ModuleBase):
         # 专辑名开头的艺术家署名前缀同样是命名习惯，用主体名检索
         title = cls._strip_artist_prefix(title, meta.artists)
         bare_title = cls._strip_artist_prefix(bare_title, meta.artists)
+        # 原声带标题的通用描述词（Original Motion Picture Soundtrack）在条目中常省略，
+        # 用电影名本体补充一级检索（The Hateful Eight / Pulp Fiction）；
+        # 本体过短（The Score 类）时不作为独立检索目标避免噪声
+        soundtrack_body = cls._soundtrack_body(bare_title)
+        if len(cls._match_text(soundtrack_body)) < 4:
+            soundtrack_body = ""
         queries: list[str] = []
         for query in [
             f'releasegroup:{cls._query_phrase(title)} AND artist:"{cls._escape_query(artist)}"'
@@ -268,6 +291,9 @@ class MusicBrainzModule(_ModuleBase):
             f"releasegroup:{cls._query_phrase(title)}" if title else None,
             f'releasegroup:{cls._query_phrase(bare_title)} AND artist:"{cls._escape_query(artist)}"'
             if artist and bare_title and bare_title != title else None,
+            f'releasegroup:{cls._query_phrase(soundtrack_body)} AND artist:"{cls._escape_query(artist)}"'
+            if artist and soundtrack_body else None,
+            f"releasegroup:{cls._query_phrase(soundtrack_body)}" if soundtrack_body else None,
             # 署名变体兜底：仅按去注释专辑名检索，挑选阶段要求艺术家同时命中
             f"releasegroup:{cls._query_phrase(bare_title)}" if bare_title else None,
         ]:
@@ -739,6 +765,15 @@ class MusicBrainzModule(_ModuleBase):
                         cls._performance_title(bare_title)
                         and cls._same_text(cls._performance_title(bare_title), album_title)
                     )
+                    # 原声带资源的描述词在条目中常省略（Pulp Fiction: Music From the…），
+                    # 电影名本体与条目标题或主标题一致视为弱匹配
+                    or (
+                        len(cls._match_text(cls._soundtrack_body(bare_title))) >= 4
+                        and (
+                            cls._same_text(cls._soundtrack_body(bare_title), album_title)
+                            or cls._same_text(cls._soundtrack_body(bare_title), cls._main_title(album_title))
+                        )
+                    )
                 )
             ):
                 # 「我爱夜 (新歌+精选)」对位条目「我爱夜」这类注释差异
@@ -844,8 +879,14 @@ class MusicBrainzModule(_ModuleBase):
         # 格式标记后紧跟的场景发布组标签（如 ALAC-HHWEB），整体剔除
         text = re.sub(r"[-–—]\s*[A-Z0-9]{3,}\s*$", "", text)
         # 曲名尾部独立年份是发行线索不是曲名一部分（解析阶段通常已提取），
-        # 检索时剥离避免年份文本造成精确短语零命中
-        text = re.sub(r"(?<!\d)\s+(?:19|20)\d{2}$", "", cls._normalize_text(text))
+        # 反复剥离尾部年份：场景命名可能重复携带（Live At Montreux 2011 2011）
+        text = cls._normalize_text(text)
+        while True:
+            # 仅剔除空白分隔的尾部年份，纯年份标题（1999）无前导空白不受影响
+            stripped = re.sub(r"\s+(?:19|20)\d{2}$", "", text)
+            if stripped == text:
+                break
+            text = stripped
         return cls._normalize_text(text)
 
     def recognize_music(self, source: str, media_id: str) -> Optional[MusicInfo]:

tests/test_metamusic.py

@@ -171,6 +171,14 @@ def test_apply_title_strips_video_tokens():
     assert meta.year == 2018
 
 
+def test_apply_title_splits_various_artists_prefix():
+    """场景命名的 Various Artists-Title 无空格连字符前缀应拆分为合辑署名。"""
+    meta = parse_title("Various.Artists-Reply.1988.OST")
+
+    assert meta.artists == ["Various Artists"]
+    assert meta.title == "Reply 1988 OST"
+
+
 def test_apply_title_restores_letter_abbrev():
     """单字母点号缩写还原不误伤合法缩写与单词。"""
     meta = parse_title("E.S.Posthumus - Ashielf Alpen FLAC")

tests/test_musicbrainz_module.py

@@ -720,6 +720,55 @@ def test_select_album_candidate_matches_contained_title():
     assert matched.media_id == "album-1"
 
 
+def test_soundtrack_body_extracts_movie_name():
+    """原声带描述词尾部剔除返回电影名本体，非原声带标题与词内后缀不受影响。"""
+    body = MusicBrainzModule._soundtrack_body
+    assert body("Pulp Fiction Original Motion Picture Soundtrack") == "Pulp Fiction"
+    assert body("Reply 1988 OST") == "Reply 1988"
+    # Ghost 尾部的 ost 是单词组成部分，不能剔除
+    assert body("Ghost") == ""
+    assert body("晴天") == ""
+
+
+def test_search_title_strips_repeated_trailing_year():
+    """场景命名重复携带的尾部年份应全部剥离，避免年份文本阻断精确匹配。"""
+    assert MusicBrainzModule._search_title("Live At Montreux 2011 2011") == "Live At Montreux"
+    # 纯年份标题无前导空白不受影响
+    assert MusicBrainzModule._search_title("1999") == "1999"
+
+
+def test_album_queries_include_soundtrack_body():
+    """原声带专辑检索阶梯应包含电影名本体变体。"""
+    queries = MusicBrainzModule._album_queries(
+        MetaMusic(title="Pulp Fiction Original Motion Picture Soundtrack",
+                  artists=["Various Artists"], year=1994)
+    )
+
+    assert 'releasegroup:"Pulp Fiction" AND artist:"Various Artists"' in queries
+
+
+def test_select_album_candidate_matches_soundtrack_body():
+    """条目以冒号副标题保留描述词时，电影名本体一致应弱匹配命中。"""
+    meta = MetaMusic(
+        title="Pulp Fiction Original Motion Picture Soundtrack",
+        artists=["Various Artists"],
+        year=1994,
+    )
+    album = MusicInfo(
+        source="musicbrainz",
+        music_type="album",
+        media_id="album-1",
+        title="Pulp Fiction: Music From the Motion Picture",
+        artists=["Various Artists"],
+        year=1994,
+    )
+
+    matched = MusicBrainzModule._select_album_candidate(meta, [album])
+
+    assert matched is not None
+    assert matched.media_id == "album-1"
+
+
 def test_select_candidate_rejects_wrong_artist_same_title():
     """已知艺术家时，同名异曲的候选不能因标题相等被采信。"""
     meta = MetaMusic(title="因为有你", artists=["毛阿敏"])