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/images/radarr.svg

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public/images/sonarr.svg

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+<svg xmlns="http://www.w3.org/2000/svg" xml:space="preserve" viewBox="0 0 512 512"><path d="M511.8 256c0 70.4-24.9 130.8-74.6 181.1-1.7 2-3.5 3.8-5.5 5.4-8.2 8-16.8 15.3-26 21.8Q341.05 512 256.3 512c-56.6 0-106.3-15.9-149.2-47.7-11.3-8-22-17.1-31.9-27.3C36.5 398.7 12.8 354 4 303.2c-1.7-9.9-2.9-20-3.4-30.2-.2-5.7-.4-11.3-.4-17 0-6 .1-11.7.4-17.1 0-.6.2-1.1.5-1.7 3.7-62.8 28.4-117 74.1-162.8C125.5 24.8 185.8 0 256.2 0c70.7 0 131 24.8 180.9 74.5q74.7 75.9 74.7 181.5" style="fill-rule:evenodd;clip-rule:evenodd;fill:#eee"/><path d="m459.7 100.3-52.9 52.9c-30.9 30.9-33.6 57.8-33.6 105.3 0 42.3 6.7 81.1 38.2 112.6 23 23 44.9 44.7 44.9 44.7-5.9 7.2-12.3 14.3-19.1 21.2-1.7 2-3.5 3.8-5.5 5.4-6 5.9-12.2 11.4-18.6 16.4l-41.4-41.4C334.9 380.6 305.6 377 257 377c-46.7 0-78.4 4.3-112.6 38.5-20.4 20.4-43.8 43.9-43.8 43.9-8.9-6.8-17.3-14.2-25.3-22.4-6.6-6.6-12.8-13.4-18.5-20.3 0 0 23.1-23.2 45.2-45.3 32.7-32.7 38-70.6 38-113 0-41.3-6.8-79.8-36.8-109.9C82.2 127.7 53.3 99 53.3 99c6.7-8.5 14-16.7 21.8-24.5 6.9-6.8 14-13.1 21.2-19l48 48c30.7 30.7 70 38.6 112.4 38.6 43.6 0 82.8-8.4 114.7-40.4C391 82.1 417 56.3 417 56.3c6.8 5.6 13.5 11.6 20.1 18.2 8.3 8.3 15.8 16.9 22.6 25.8" style="fill-rule:evenodd;clip-rule:evenodd;fill:#3a3f51"/><path d="M186 269.1c-.5-2.8-.8-5.5-.9-8.4-.1-1.6-.1-3.1-.1-4.7 0-1.7 0-3.2.1-4.7 0-.2 0-.3.1-.5 1-17.4 7.9-32.4 20.5-45.1 13.9-13.8 30.6-20.7 50.2-20.7s36.3 6.9 50.2 20.7c13.8 14 20.7 30.8 20.7 50.3s-6.9 36.2-20.7 50.2c-.5.5-1 1.1-1.5 1.5q-3.45 3.3-7.2 6-18 13.2-41.4 13.2c-23.4 0-29.4-4.4-41.3-13.2-3.1-2.2-6.1-4.7-8.9-7.6-10.8-10.6-17.3-22.9-19.8-37" style="fill-rule:evenodd;clip-rule:evenodd;fill:#0cf"/><path d="m372.7 141-35.4 34.6M72.9 76.8l96.5 96.1m199.7 198.9 65.6 67.9m4.4-363.3L372.7 141M76.6 438.5l64.6-64.7" style="fill:none;stroke:#0cf;stroke-width:2;stroke-miterlimit:1"/><path d="m372.7 141-40 40.6m-193.3-38.5 40.6 40.5M141 374l39.5-41.1m146.2-3.3 42.6 42.4" style="fill:none;stroke:#0cf;stroke-width:7;stroke-miterlimit:1"/></svg>

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;