添加清空缓存按钮

public/js/main.js

@@ -2,6 +2,7 @@ document.addEventListener('DOMContentLoaded', () => {
     const videoListEl = document.getElementById('video-list');
     const loadingSpinner = document.getElementById('loading-spinner');
     const refreshBtn = document.getElementById('refresh-btn');
+    const resetCacheBtn = document.getElementById('reset-cache-btn');
     const codecSelect = document.getElementById('codec-select');
     const encoderSelect = document.getElementById('encoder-select');
     const playerOverlay = document.getElementById('player-overlay');
@@ -89,6 +90,45 @@ document.addEventListener('DOMContentLoaded', () => {
         progressFill.style.width = '0%';
     };
 
+    const resetCache = async () => {
+        if (!resetCacheBtn) return;
+        resetCacheBtn.disabled = true;
+        resetCacheBtn.title = 'Resetting cache...';
+
+        stopPolling();
+        selectedKey = null;
+        currentVideoKey = null;
+        subscribedKey = null;
+        if (transcodeBtn) {
+            transcodeBtn.classList.add('hidden');
+        }
+        if (playBtn) {
+            playBtn.classList.add('hidden');
+        }
+        if (playerOverlay) {
+            playerOverlay.classList.remove('hidden');
+        }
+        if (nowPlaying) {
+            nowPlaying.classList.add('hidden');
+        }
+        resetProgress();
+
+        try {
+            const res = await fetch('/api/reset-cache', { method: 'POST' });
+            if (!res.ok) {
+                const data = await res.json().catch(() => ({}));
+                throw new Error(data.error || 'Reset failed');
+            }
+            await fetchVideos();
+        } catch (err) {
+            console.error('Reset cache failed:', err);
+            alert(`Reset cache failed: ${err.message}`);
+        } finally {
+            resetCacheBtn.disabled = false;
+            resetCacheBtn.title = 'Reset Download Cache';
+        }
+    };
+
     if (transcodeBtn) {
         transcodeBtn.addEventListener('click', () => {
             startTranscode();