Rewrite HAOS integration: target-centric architecture with KC color sensors

- Rewrite integration to target-centric model: each picture target becomes
  a HA device under a server hub with switch, FPS, and status sensors
- Replace KC light entities with color sensors (hex state + RGB attributes)
  for better automation support via WebSocket real-time updates
- Add WebSocket manager for Key Colors color streaming
- Add KC per-stage timing metrics (calc_colors, broadcast) with rolling avg
- Fix KC timing fields missing from API by adding them to Pydantic schema
- Make start/stop processing idempotent to prevent intermittent 404 errors
- Add HAOS localization support (en, ru) using translation_key system
- Rename integration from "WLED Screen Controller" to "LED Screen Controller"
- Remove obsolete select.py (display select) and README.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

custom_components/wled_screen_controller/manifest.json

@@ -1,12 +1,12 @@
 {
   "domain": "wled_screen_controller",
-  "name": "WLED Screen Controller",
+  "name": "LED Screen Controller",
   "codeowners": ["@alexeidolgolyov"],
   "config_flow": true,
   "dependencies": [],
   "documentation": "https://github.com/yourusername/wled-screen-controller",
-  "iot_class": "local_polling",
+  "iot_class": "local_push",
   "issue_tracker": "https://github.com/yourusername/wled-screen-controller/issues",
   "requirements": ["aiohttp>=3.9.0"],
-  "version": "0.1.0"
+  "version": "0.2.0"
 }