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/openapi.yaml

@@ -49,6 +49,8 @@ tags:
     description: SABnzbd API proxy
   - name: Emby
     description: Emby/Jellyfin API proxy
+  - name: Ombi
+    description: Ombi request management
 
 security:
   - CookieAuth: []
@@ -155,6 +157,21 @@ components:
           nullable: true
           description: Sonarr/Radarr type
           example: "series"
+        ombiLink:
+          type: string
+          nullable: true
+          description: Link to Ombi request or search
+          example: "https://ombi.example.com/#/request/movie/123"
+        ombiRequestId:
+          type: string
+          nullable: true
+          description: Ombi request ID (if request exists)
+          example: "123"
+        ombiTooltip:
+          type: string
+          nullable: true
+          description: Tooltip text for Ombi icon ("Request" or "Search")
+          example: "Request"
 
     DashboardPayload:
       type: object