refactor(tmdb): 空结果缓存过期时间收敛为设置项 EMPTY_RESULT_CACHE_TTL

- ConfigModel TMDB 配置区新增 EMPTY_RESULT_CACHE_TTL（默认 30 分钟），支持环境变量覆盖
- request/async_request/discover/TmdbCache 统一改读 settings，移除模块级常量与跨模块导入

app/modules/themoviedb/tmdbv3api/objs/discover.py

@@ -1,5 +1,6 @@
 from app.runtime.cache import cached
-from ..tmdb import TMDb, EMPTY_RESULT_CACHE_TTL
+from app.runtime.config import settings
+from ..tmdb import TMDb
 
 try:
     from urllib import urlencode
@@ -13,7 +14,7 @@ class Discover(TMDb):
         "tv": "/discover/tv"
     }
 
-    @cached(maxsize=1, ttl=43200, empty_ttl=EMPTY_RESULT_CACHE_TTL)
+    @cached(maxsize=1, ttl=43200, empty_ttl=settings.EMPTY_RESULT_CACHE_TTL)
     def discover_movies(self, params_tuple):
         """
         Discover movies by different types of data like average rating, number of votes, genres and certifications.
@@ -23,7 +24,7 @@ class Discover(TMDb):
         params = dict(params_tuple)
         return self._request_obj(self._urls["movies"], urlencode(params), key="results", call_cached=False)
 
-    @cached(maxsize=1, ttl=43200, empty_ttl=EMPTY_RESULT_CACHE_TTL)
+    @cached(maxsize=1, ttl=43200, empty_ttl=settings.EMPTY_RESULT_CACHE_TTL)
     def discover_tv_shows(self, params_tuple):
         """
         Discover TV shows by different types of data like average rating, number of votes, genres,
@@ -33,7 +34,7 @@ class Discover(TMDb):
         """
         return self._request_obj(self._urls["tv"], urlencode(params_tuple), key="results", call_cached=False)
 
-    @cached(maxsize=1, ttl=43200, empty_ttl=EMPTY_RESULT_CACHE_TTL)
+    @cached(maxsize=1, ttl=43200, empty_ttl=settings.EMPTY_RESULT_CACHE_TTL)
     async def async_discover_movies(self, params_tuple):
         """
         Discover movies by different types of data like average rating, number of votes, genres and certifications.（异步版本）
@@ -43,7 +44,7 @@ class Discover(TMDb):
         params = dict(params_tuple)
         return await self._async_request_obj(self._urls["movies"], urlencode(params), key="results", call_cached=False)
 
-    @cached(maxsize=1, ttl=43200, empty_ttl=EMPTY_RESULT_CACHE_TTL)
+    @cached(maxsize=1, ttl=43200, empty_ttl=settings.EMPTY_RESULT_CACHE_TTL)
     async def async_discover_tv_shows(self, params_tuple):
         """
         Discover TV shows by different types of data like average rating, number of votes, genres,

app/modules/themoviedb/tmdbv3api/tmdb.py

@@ -22,11 +22,6 @@ logger = logging.getLogger(__name__)
 # 故取区间内的经验值。
 RETRY_BACKOFF_SECONDS = 2
 
-# 空结果缓存的独立过期时间（秒）。TMDB 代理故障期间「合法 JSON 但 results 为空」的
-# 响应会随默认 TTL（可达数十小时）固化，故障自愈后同 key 仍持续命中空结果；空结果
-# 改用 30 分钟短 TTL，既能拦住故障窗口内的重复回源，又能在故障恢复后较快自然失效。
-EMPTY_RESULT_CACHE_TTL = 30 * 60
-
 
 def _is_business_failure_snapshot(snapshot) -> bool:
     """
@@ -47,8 +42,8 @@ def _is_empty_result_snapshot(snapshot) -> bool:
     判断响应快照是否为空结果（列表/搜索类接口的 results 为空列表）。
 
     这类快照结构合法但无业务内容，常由代理瞬时故障产生；不能靠 skip_none/skip_empty
-    识别（快照本身是非空字典），需单独谓词判定后按 EMPTY_RESULT_CACHE_TTL 短 TTL
-    缓存。详情类接口无 results 字段，不属于空结果。
+    识别（快照本身是非空字典），需单独谓词判定后按 settings.EMPTY_RESULT_CACHE_TTL
+    短 TTL 缓存。详情类接口无 results 字段，不属于空结果。
     """
     if not isinstance(snapshot, dict):
         return False
@@ -180,7 +175,7 @@ class TMDb(object):
 
     @cached(maxsize=settings.CONF.tmdb, ttl=settings.CONF.meta, skip_none=True,
             skip_if=_is_business_failure_snapshot,
-            empty_ttl=EMPTY_RESULT_CACHE_TTL, empty_if=_is_empty_result_snapshot)
+            empty_ttl=settings.EMPTY_RESULT_CACHE_TTL, empty_if=_is_empty_result_snapshot)
     def request(self, method, url, data, json, **kwargs):
         req = self._request_once(method, url, data, json)
         if req is None and method == "GET" and self._owns_session:
@@ -206,7 +201,7 @@ class TMDb(object):
 
     @cached(maxsize=settings.CONF.tmdb, ttl=settings.CONF.meta, skip_none=True,
             skip_if=_is_business_failure_snapshot,
-            empty_ttl=EMPTY_RESULT_CACHE_TTL, empty_if=_is_empty_result_snapshot)
+            empty_ttl=settings.EMPTY_RESULT_CACHE_TTL, empty_if=_is_empty_result_snapshot)
     async def async_request(self, method, url, data, json, **kwargs):
         req = await self._async_request_once(method, url, data, json)
         if req is None: