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/src/wled_controller/config.py

@@ -1,4 +1,4 @@
-"""Configuration management for LED Grab."""
+"""Configuration management for WLED Screen Controller."""
 
 import os
 from pathlib import Path
@@ -24,32 +24,6 @@ class AuthConfig(BaseSettings):
     api_keys: dict[str, str] = {}  # label: key mapping (required for security)
 
 
-class ProcessingConfig(BaseSettings):
-    """Processing configuration."""
-
-    default_fps: int = 30
-    max_fps: int = 90
-    min_fps: int = 10
-    border_width: int = 10
-    interpolation_mode: Literal["average", "median", "dominant"] = "average"
-
-
-class ScreenCaptureConfig(BaseSettings):
-    """Screen capture configuration."""
-
-    buffer_size: int = 2
-
-
-class WLEDConfig(BaseSettings):
-    """WLED client configuration."""
-
-    timeout: int = 5
-    retry_attempts: int = 3
-    retry_delay: int = 1
-    protocol: Literal["http", "https"] = "http"
-    max_brightness: int = 255
-
-
 class StorageConfig(BaseSettings):
     """Storage configuration."""
 
@@ -81,9 +55,6 @@ class Config(BaseSettings):
 
     server: ServerConfig = Field(default_factory=ServerConfig)
     auth: AuthConfig = Field(default_factory=AuthConfig)
-    processing: ProcessingConfig = Field(default_factory=ProcessingConfig)
-    screen_capture: ScreenCaptureConfig = Field(default_factory=ScreenCaptureConfig)
-    wled: WLEDConfig = Field(default_factory=WLEDConfig)
     storage: StorageConfig = Field(default_factory=StorageConfig)
     logging: LoggingConfig = Field(default_factory=LoggingConfig)