feat: Add series TV support with Vidzy HLS downloads and duplicate prevention

Major improvements:
- Series TV support via FS7 provider with dedicated search endpoint
- Vidzy downloader now uses Playwright for JS obfuscation and ffmpeg for HLS streams
- Episode filenames properly named (Series Title - Episode X) instead of master.m3u8.mp4
- Duplicate download prevention: checks existing tasks before creating new ones
- Removed host preference system in favor of intelligent URL-based detection

Technical changes:
- Vidzy: Added Playwright extraction and M3U8→MP4 conversion with ffmpeg
- FS7: Episodes now use pipe format (video_url|series_url|episode_title)
- DownloadManager: Extract target_filename from pipe URL and prevent duplicates
- UI: New Series tab with search, recommendations, and releases sections
- Anime-Sama: Removed hardcoded host preferences, uses site's URL order

Generated with [Claude Code](https://claude.com/claude-code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

static/js/api.js

@@ -149,3 +149,15 @@ async function cancelDownload(id) {
 
     return await response.json();
 }
+
+// Make functions available globally
+window.getProvidersInfo = getProvidersInfo;
+window.searchAnime = searchAnime;
+window.loadEpisodes = loadEpisodes;
+window.downloadEpisode = downloadEpisode;
+window.downloadSeason = downloadSeason;
+window.startDownload = startDownload;
+window.getDownloads = getDownloads;
+window.pauseDownload = pauseDownload;
+window.resumeDownload = resumeDownload;
+window.cancelDownload = cancelDownload;