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

README.md

@@ -93,6 +93,7 @@ SONARR_INSTANCES=[{"name":"main","url":"...","apiKey":"..."}]
 - Sonarr (optional, for TV tracking)
 - Radarr (optional, for movie tracking)
 - Emby (for user authentication)
+- Ombi (optional, for request management integration)
 
 ## Docker Deployment (Recommended)
 
@@ -305,6 +306,32 @@ RTORRENT_USERNAME=rtorrent
 RTORRENT_PASSWORD=rtorrent
 ```
 
+### Ombi Integration (Optional)
+
+sofarr integrates with Ombi for request management, allowing downloads to be linked to their originating Ombi requests. This provides direct access to request details and enables seamless navigation between downloads and requests.
+
+**Configuration:**
+```bash
+# JSON array format (recommended for multiple instances)
+OMBI_INSTANCES=[{"name":"main","url":"https://ombi.example.com","apiKey":"your-ombi-api-key"}]
+
+# Legacy single-instance format
+OMBI_URL=https://ombi.example.com
+OMBI_API_KEY=your-ombi-api-key
+```
+
+**How it works:**
+- Downloads are matched to Ombi requests using external IDs (TMDB, TVDB, IMDB)
+- When a matching request is found, an Ombi icon appears in the download card
+- Clicking the icon opens the Ombi request page
+- If no request exists, a search link is provided instead
+- Integration is fully optional - sofarr works perfectly without Ombi configured
+
+**External ID Matching:**
+- **TV Shows**: TVDB ID (primary) → TMDB ID (fallback)
+- **Movies**: TMDB ID (primary) → IMDB ID (fallback)
+- Matching is performed automatically using data from Sonarr/Radarr
+
 ## Setting Up User Tags
 
 To see your downloads, you need to tag your media in Sonarr/Radarr: