feat: add Ombi requests tab and webhook panel integration

- Add Ombi requests tab UI with movie/TV request display
- Add showAll parameter support for Ombi requests (API and SSE)
- Add Ombi webhook panel with enable/test functionality
- Add Ombi webhook status endpoint with metrics
- Add Ombi webhook test endpoint
- Change GET /api/ombi/requests to use OmbiRetriever instead of cache
- Add Ombi webhook state and API functions to frontend
- Update SSE payload to include Ombi baseUrl and requests

client/src/sse.js

@@ -25,6 +25,16 @@ export function startSSE() {
         const filterUpdateEvent = new CustomEvent('downloadClientsUpdated');
         document.dispatchEvent(filterUpdateEvent);
       }
+      // Store Ombi requests and base URL
+      if (data.ombiRequests) {
+        state.ombiRequests = data.ombiRequests;
+        // Trigger requests update event
+        const requestsUpdateEvent = new CustomEvent('ombiRequestsUpdated');
+        document.dispatchEvent(requestsUpdateEvent);
+      }
+      if (data.ombiBaseUrl) {
+        state.ombiBaseUrl = data.ombiBaseUrl;
+      }
       document.getElementById('currentUser').textContent = state.currentUser || '-';
       renderDownloads();
       hideError();