feat: compact media library sqlite storage

lib/pages/media_library_page.dart

@@ -249,6 +249,14 @@ class _MediaLibraryPageState extends ConsumerState<MediaLibraryPage> {
           child: const Text('导入数据'),
         ),
         const SizedBox(width: 8),
+        ShadButton.outline(
+          onPressed: _backupBusy || state.isScanning
+              ? null
+              : _optimizeScrapedStorage,
+          leading: const Icon(Icons.cleaning_services_rounded, size: 16),
+          child: const Text('数据库瘦身'),
+        ),
+        const SizedBox(width: 8),
         ShadButton.outline(
           onPressed: state.selectedLibrary == null || state.isScanning
               ? null
@@ -785,6 +793,15 @@ class _MediaLibraryPageState extends ConsumerState<MediaLibraryPage> {
     }
   }
 
+  Future<void> _optimizeScrapedStorage() async {
+    setState(() => _backupBusy = true);
+    try {
+      await ref.read(mediaLibraryProvider.notifier).optimizeLocalStorage();
+    } finally {
+      if (mounted) setState(() => _backupBusy = false);
+    }
+  }
+
   Future<void> _searchTMDB(String query) async {
     final text = query.trim();
     if (text.isEmpty || _tmdbApiKey.isEmpty) return;