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>

server/config/default_config.yaml

@@ -12,25 +12,13 @@ auth:
     # Generate secure keys: openssl rand -hex 32
     dev: "development-key-change-in-production"  # Development key - CHANGE THIS!
 
-processing:
-  default_fps: 30
-  max_fps: 60
-  min_fps: 1
-  border_width: 10  # pixels to sample from screen edge
-  interpolation_mode: "average"  # average, median, dominant
-
-screen_capture:
-  buffer_size: 2  # Number of frames to buffer
-
-wled:
-  timeout: 5  # seconds
-  retry_attempts: 3
-  retry_delay: 1  # seconds
-  protocol: "http"  # http or https
-  max_brightness: 255
-
 storage:
   devices_file: "data/devices.json"
+  templates_file: "data/capture_templates.json"
+  postprocessing_templates_file: "data/postprocessing_templates.json"
+  picture_sources_file: "data/picture_sources.json"
+  picture_targets_file: "data/picture_targets.json"
+  pattern_templates_file: "data/pattern_templates.json"
 
 logging:
   format: "json"  # json or text