feat(cache): 使用 fresh 和 async_fresh 统一缓存控制方式

- 修复因缓存导致的插件更新后仍有更新提示的问题
- 统一使用 fresh/async_fresh 控制缓存行为
- 调整 TMDb 模块缓存策略，优化异步请求缓存清除机制
- 移除冗余的缓存方法封装，减少调用层级
- 简化 PluginHelper 中的缓存方法结构，移除 force 参数

app/core/cache.py

@@ -1025,10 +1025,12 @@ def fresh(fresh: bool = True):
         result = some_cached_function()
     """
     token = _fresh.set(fresh)
+    logger.debug(f"Setting fresh mode to {fresh}. {id(token):#x}")
     try:
         yield
     finally:
         _fresh.reset(token)
+        logger.debug(f"Reset fresh mode. {id(token):#x}")
 
 @asynccontextmanager
 async def async_fresh(fresh: bool = True):
@@ -1040,10 +1042,12 @@ async def async_fresh(fresh: bool = True):
         result = await some_async_cached_function()
     """
     token = _fresh.set(fresh)
+    logger.debug(f"Setting async_fresh mode to {fresh}. {id(token):#x}")
     try:
         yield
     finally:
         _fresh.reset(token)
+        logger.debug(f"Reset async_fresh mode. {id(token):#x}")
 
 def is_fresh() -> bool:
     """