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/anime.js

@@ -338,8 +338,21 @@ async function handleSearch() {
     await searchAnimeDetails(query);
 }
 
+// Handle anime search (new dedicated function)
+async function handleAnimeSearch() {
+    const searchInput = document.getElementById('animeSearchInput') || document.getElementById('searchInput');
+    if (!searchInput) return;
+
+    const query = searchInput.value.trim();
+    if (!query) return;
+
+    // Use the new anime details search
+    await searchAnimeDetails(query);
+}
+
 // Ensure global scope
 window.handleSearch = handleSearch;
+window.handleAnimeSearch = handleAnimeSearch;
 
 /**
  * Handle direct download form submission