Add notification system with admin UI and backend

Introduces a full notification system with support for Discord and Pushover backends, event triggers, and message formatting. Adds backend services, processors, and API endpoints for managing notifications, as well as a new Notifications tab in the admin settings UI. Updates documentation, database schema, and tests to cover notification features and approval workflow improvements. Also changes project license from MIT to AGPL v3.

src/app/api/requests/[id]/interactive-search/route.ts

@@ -63,6 +63,14 @@ export async function POST(
         );
       }
 
+      // Check if request is awaiting approval
+      if (requestRecord.status === 'awaiting_approval') {
+        return NextResponse.json(
+          { error: 'AwaitingApproval', message: 'This request is awaiting admin approval. You cannot search for torrents until it is approved.' },
+          { status: 403 }
+        );
+      }
+
       // Get enabled indexers from configuration
       const { getConfigService } = await import('@/lib/services/config.service');
       const configService = getConfigService();