feat: add optimizationEnabled switch

src/components/EpisodeSelector.tsx

@@ -162,10 +162,30 @@ const EpisodeSelector: React.FC<EpisodeSelectorProps> = ({
     }
   }, [precomputedVideoInfo]);
 
+  // 读取本地“优选和测速”开关，默认开启
+  const [optimizationEnabled] = useState<boolean>(() => {
+    if (typeof window !== 'undefined') {
+      const saved = localStorage.getItem('enableOptimization');
+      if (saved !== null) {
+        try {
+          return JSON.parse(saved);
+        } catch {
+          /* ignore */
+        }
+      }
+    }
+    return true;
+  });
+
   // 当切换到换源tab并且有源数据时，异步获取视频信息 - 移除 attemptedSources 依赖避免循环触发
   useEffect(() => {
     const fetchVideoInfosInBatches = async () => {
-      if (activeTab !== 'sources' || availableSources.length === 0) return;
+      if (
+        !optimizationEnabled || // 若关闭测速则直接退出
+        activeTab !== 'sources' ||
+        availableSources.length === 0
+      )
+        return;
 
       // 筛选出尚未测速的播放源
       const pendingSources = availableSources.filter((source) => {
@@ -185,7 +205,7 @@ const EpisodeSelector: React.FC<EpisodeSelectorProps> = ({
 
     fetchVideoInfosInBatches();
     // 依赖项保持与之前一致
-  }, [activeTab, availableSources, getVideoInfo]);
+  }, [activeTab, availableSources, getVideoInfo, optimizationEnabled]);
 
   // 升序分页标签
   const categoriesAsc = useMemo(() => {
@@ -511,11 +531,11 @@ const EpisodeSelector: React.FC<EpisodeSelectorProps> = ({
                               }
 
                               // 始终显示占位符，确保布局一致且分辨率信息始终可见
-                              return (
+                              return optimizationEnabled ? (
                                 <div className='bg-gray-500/10 dark:bg-gray-400/20 text-gray-500 dark:text-gray-400 px-1.5 py-0 rounded text-xs flex-shrink-0 min-w-[50px] text-center'>
                                   检测中
                                 </div>
-                              );
+                              ) : null;
                             })()}
                           </div>