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/main.js

@@ -17,12 +17,22 @@ document.addEventListener('DOMContentLoaded', () => {
  * Initialize form event listeners
  */
 function initializeForms() {
-    // Search form
-    const searchInput = document.getElementById('searchInput');
-    if (searchInput) {
-        searchInput.addEventListener('keypress', (e) => {
+    // Anime search form
+    const animeSearchInput = document.getElementById('animeSearchInput');
+    if (animeSearchInput) {
+        animeSearchInput.addEventListener('keypress', (e) => {
             if (e.key === 'Enter') {
-                handleSearch();
+                handleAnimeSearch();
+            }
+        });
+    }
+
+    // Series search form
+    const seriesSearchInput = document.getElementById('seriesSearchInput');
+    if (seriesSearchInput) {
+        seriesSearchInput.addEventListener('keypress', (e) => {
+            if (e.key === 'Enter') {
+                handleSeriesSearch();
             }
         });
     }
@@ -209,10 +219,6 @@ function switchTab(tabName) {
 
         if (tabType === 'home' && tabName === 'home') {
             btn.classList.add('active');
-        } else if (tabType === 'search' && tabName === 'search') {
-            btn.classList.add('active');
-        } else if (tabType === 'direct' && tabName === 'direct') {
-            btn.classList.add('active');
         } else if (tabType === 'anime' && tabName === 'anime') {
             // Static anime tab
             btn.classList.add('active');