Introduce Picture Targets to separate processing from devices

Add PictureTarget entity that bridges PictureSource to output device,
separating processing settings from device connection/calibration state.
This enables future target types (Art-Net, E1.31) and cleanly decouples
"what to stream" from "where to stream."

- Add PictureTarget/WledPictureTarget dataclasses and storage
- Split ProcessorManager into DeviceState (health) + TargetState (processing)
- Add /api/v1/picture-targets endpoints (CRUD, start/stop, settings, metrics)
- Simplify device API (remove processing/settings/metrics endpoints)
- Auto-migrate existing device settings to picture targets on first startup
- Add Targets tab to WebUI with target cards and editor modal
- Add en/ru locale keys for targets UI

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

server/src/wled_controller/api/schemas/devices.py

@@ -1,12 +1,10 @@
-"""Device-related schemas (CRUD, settings, calibration, processing state, metrics)."""
+"""Device-related schemas (CRUD, calibration, device state)."""
 
 from datetime import datetime
 from typing import Dict, List, Literal, Optional
 
 from pydantic import BaseModel, Field
 
-from wled_controller.core.processor_manager import DEFAULT_STATE_CHECK_INTERVAL
-
 
 class DeviceCreate(BaseModel):
     """Request to create/attach a WLED device."""
@@ -21,34 +19,6 @@ class DeviceUpdate(BaseModel):
     name: Optional[str] = Field(None, description="Device name", min_length=1, max_length=100)
     url: Optional[str] = Field(None, description="WLED device URL")
     enabled: Optional[bool] = Field(None, description="Whether device is enabled")
-    picture_source_id: Optional[str] = Field(None, description="Picture source ID")
-
-
-class ColorCorrection(BaseModel):
-    """Color correction settings."""
-
-    gamma: float = Field(default=2.2, description="Gamma correction", ge=0.1, le=5.0)
-    saturation: float = Field(default=1.0, description="Saturation multiplier", ge=0.0, le=2.0)
-    brightness: float = Field(default=1.0, description="Brightness multiplier", ge=0.0, le=1.0)
-
-
-class ProcessingSettings(BaseModel):
-    """Processing settings for a device."""
-
-    display_index: int = Field(default=0, description="Display to capture", ge=0)
-    fps: int = Field(default=30, description="Target frames per second", ge=10, le=90)
-    border_width: int = Field(default=10, description="Border width in pixels", ge=1, le=100)
-    interpolation_mode: str = Field(default="average", description="LED color interpolation mode (average, median, dominant)")
-    brightness: float = Field(default=1.0, description="Global brightness (0.0-1.0)", ge=0.0, le=1.0)
-    smoothing: float = Field(default=0.3, description="Temporal smoothing factor (0.0=none, 1.0=full)", ge=0.0, le=1.0)
-    state_check_interval: int = Field(
-        default=DEFAULT_STATE_CHECK_INTERVAL, ge=5, le=600,
-        description="Seconds between WLED health checks"
-    )
-    color_correction: Optional[ColorCorrection] = Field(
-        default_factory=ColorCorrection,
-        description="Color correction settings"
-    )
 
 
 class Calibration(BaseModel):
@@ -109,12 +79,7 @@ class DeviceResponse(BaseModel):
     url: str = Field(description="WLED device URL")
     led_count: int = Field(description="Total number of LEDs")
     enabled: bool = Field(description="Whether device is enabled")
-    status: Literal["connected", "disconnected", "error"] = Field(
-        description="Connection status"
-    )
-    settings: ProcessingSettings = Field(description="Processing settings")
     calibration: Optional[Calibration] = Field(None, description="Calibration configuration")
-    picture_source_id: str = Field(default="", description="ID of assigned picture source")
     created_at: datetime = Field(description="Creation timestamp")
     updated_at: datetime = Field(description="Last update timestamp")
 
@@ -126,16 +91,10 @@ class DeviceListResponse(BaseModel):
     count: int = Field(description="Number of devices")
 
 
-class ProcessingState(BaseModel):
-    """Processing state for a device."""
+class DeviceStateResponse(BaseModel):
+    """Device health/connection state response."""
 
     device_id: str = Field(description="Device ID")
-    processing: bool = Field(description="Whether processing is active")
-    fps_actual: Optional[float] = Field(None, description="Actual FPS achieved")
-    fps_target: int = Field(description="Target FPS")
-    display_index: int = Field(description="Current display index")
-    last_update: Optional[datetime] = Field(None, description="Last successful update")
-    errors: List[str] = Field(default_factory=list, description="Recent errors")
     wled_online: bool = Field(default=False, description="Whether WLED device is reachable")
     wled_latency_ms: Optional[float] = Field(None, description="WLED health check latency in ms")
     wled_name: Optional[str] = Field(None, description="WLED device name")
@@ -145,17 +104,5 @@ class ProcessingState(BaseModel):
     wled_led_type: Optional[str] = Field(None, description="LED chip type (e.g. WS2812B, SK6812 RGBW)")
     wled_last_checked: Optional[datetime] = Field(None, description="Last health check time")
     wled_error: Optional[str] = Field(None, description="Last health check error")
-
-
-class MetricsResponse(BaseModel):
-    """Device metrics response."""
-
-    device_id: str = Field(description="Device ID")
-    processing: bool = Field(description="Whether processing is active")
-    fps_actual: Optional[float] = Field(None, description="Actual FPS")
-    fps_target: int = Field(description="Target FPS")
-    uptime_seconds: float = Field(description="Processing uptime in seconds")
-    frames_processed: int = Field(description="Total frames processed")
-    errors_count: int = Field(description="Total error count")
-    last_error: Optional[str] = Field(None, description="Last error message")
-    last_update: Optional[datetime] = Field(None, description="Last update timestamp")
+    test_mode: bool = Field(default=False, description="Whether calibration test mode is active")
+    test_mode_edges: List[str] = Field(default_factory=list, description="Currently lit edges in test mode")