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

public/style.css

@@ -3,6 +3,27 @@
   display: none !important;
 }
 
+/* ===== Service Icons ===== */
+.service-icons-container {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  margin-right: 6px;
+}
+
+.service-icon {
+  height: 1.2em; /* Match text height */
+  width: auto;
+  vertical-align: middle;
+  cursor: pointer;
+  opacity: 0.8;
+  transition: opacity 0.2s ease;
+}
+
+.service-icon:hover {
+  opacity: 1;
+}
+
 /* ===== Splash Screen ===== */
 .splash-screen {
   position: fixed;