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/state.js

@@ -9,6 +9,8 @@ export const state = {
   isAdmin: false,
   showAll: false,
   csrfToken: null, // double-submit CSRF token, sent as X-CSRF-Token on mutating requests
+  ombiBaseUrl: null, // Ombi base URL for generating links
+  ombiRequests: null, // Ombi requests data
   
   // History section state
   historyDays: 7, // Default value, will be loaded from localStorage
@@ -28,6 +30,7 @@ export const state = {
   webhookLoading: false,
   sonarrWebhook: { enabled: false, triggers: { onGrab: false, onDownload: false, onImport: false, onUpgrade: false }, stats: null },
   radarrWebhook: { enabled: false, triggers: { onGrab: false, onDownload: false, onImport: false, onUpgrade: false }, stats: null },
+  ombiWebhook: { enabled: false, triggers: { requestAvailable: false, requestApproved: false, requestDeclined: false, requestPending: false, requestProcessing: false }, stats: null },
   webhookMetrics: null
 };