debug: add detailed logging for template filtering

Add console logs to track template filtering process on home and video pages to diagnose black screen issue. Logs include all preview URL fields and filtering decisions.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/(tabs)/video.tsx

@@ -169,7 +169,10 @@ export default function VideoScreen() {
         // 有显示URL且不是视频格式才保留
         const shouldKeep = !!displayUrl && !isDisplayVideo
 
-        console.log(`Filtering ${item.title}:`, {
+        console.log(`[VIDEO PAGE] Filtering ${item.title}:`, {
+            webpHighPreviewUrl: item.webpHighPreviewUrl,
+            webpPreviewUrl: item.webpPreviewUrl,
+            previewUrl: item.previewUrl,
             displayUrl,
             isDisplayVideo,
             shouldKeep,