feat(ombi): Add Ombi PALDRA integration for request management

- Add OmbiRetriever extending ArrRetriever for PALDRA compliance
- Add OmbiClient for low-level Ombi API communication
- Add getOmbiInstances() to config.js following multi-instance pattern
- Register Ombi in PALDRA registry with Ombi-specific methods
- Add external ID matching (TMDB/TVDB/IMDB) to Ombi requests
- Update DownloadMatcher to be async and enrich downloads with Ombi links
- Add getOmbiLink/getOmbiSearchLink helpers to DownloadAssembler
- Implement new service icon layout (Ombi + Sonarr/Radarr icons)
- Add CSS styling for service icons
- Update dashboard routes to include Ombi configuration
- Extend OpenAPI with Ombi tag and NormalizedDownload properties
- Update documentation (README, ARCHITECTURE, SECURITY, CHANGELOG)
- Add Ombi configuration to .env.sample

server/services/DownloadBuilder.js

@@ -22,9 +22,11 @@ const DownloadMatcher = require('./DownloadMatcher');
  * @param {Map} options.sonarrTagMap - Map of Sonarr tag IDs to labels
  * @param {Map} options.radarrTagMap - Map of Radarr tag IDs to labels
  * @param {Map} options.embyUserMap - Map of Emby users for admin view
+ * @param {OmbiRetriever} options.ombiRetriever - Ombi data retriever instance (optional)
+ * @param {string} options.ombiBaseUrl - Ombi base URL for link generation (optional)
  * @returns {Array} Array of download objects for the user
  */
-function buildUserDownloads(cacheSnapshot, { username, usernameSanitized, isAdmin, showAll, seriesMap, moviesMap, sonarrTagMap, radarrTagMap, embyUserMap }) {
+function buildUserDownloads(cacheSnapshot, { username, usernameSanitized, isAdmin, showAll, seriesMap, moviesMap, sonarrTagMap, radarrTagMap, embyUserMap, ombiRetriever, ombiBaseUrl }) {
   // Input validation
   if (!cacheSnapshot || typeof cacheSnapshot !== 'object') {
     console.error('[DownloadBuilder] Invalid cacheSnapshot provided');
@@ -62,7 +64,9 @@ function buildUserDownloads(cacheSnapshot, { username, usernameSanitized, isAdmi
     embyUserMap: embyUserMap || new Map(),
     queueStatus,
     queueSpeed,
-    queueKbpersec
+    queueKbpersec,
+    ombiRetriever,
+    ombiBaseUrl
   };
 
   // Match all download sources