feat: Add Ombi request filtering and search

- Add request filters UI (type, status, sort, search)
- Implement dual-layer filtering (server + client)
- Add ombiFilters utility for consistent filtering logic
- Persist filter preferences in localStorage
- Add SSE support for real-time Ombi request updates
- Add webhook endpoints for Ombi integration
- Update OpenAPI spec for new endpoints
- Add unit tests for filter logic and UI
- Add integration tests for Ombi routes

client/src/main.js

@@ -3,6 +3,7 @@
 // Bootstrap - wire all event handlers on DOMContentLoaded
 import { checkAuthenticationAndInit, handleLogin, handleLogoutClick } from './ui/auth.js';
 import { initDownloadClientFilter } from './ui/filters.js';
+import { initRequestFilters } from './ui/requestFilters.js';
 import { initHistoryControls } from './ui/history.js';
 import { toggleStatusPanel } from './ui/statusPanel.js';
 import { initWebhooks } from './ui/webhooks.js';
@@ -46,6 +47,7 @@ document.addEventListener('DOMContentLoaded', () => {
   initThemeSwitcher();
   initTabs();
   initDownloadClientFilter();
+  initRequestFilters();
   initHistoryControls();
   initWebhooks();