Add mock LED device type for testing without hardware

Virtual device with configurable LED count, RGB/RGBW mode, and simulated
send latency. Includes full provider/client implementation, API schema
support, and frontend add/settings modal integration.

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

server/src/wled_controller/storage/device_store.py

@@ -30,6 +30,8 @@ class Device:
         baud_rate: Optional[int] = None,
         software_brightness: int = 255,
         auto_shutdown: bool = False,
+        send_latency_ms: int = 0,
+        rgbw: bool = False,
         created_at: Optional[datetime] = None,
         updated_at: Optional[datetime] = None,
     ):
@@ -42,6 +44,8 @@ class Device:
         self.baud_rate = baud_rate
         self.software_brightness = software_brightness
         self.auto_shutdown = auto_shutdown
+        self.send_latency_ms = send_latency_ms
+        self.rgbw = rgbw
         self.created_at = created_at or datetime.utcnow()
         self.updated_at = updated_at or datetime.utcnow()
         # Preserved from old JSON for migration — not written back
@@ -65,6 +69,10 @@ class Device:
             d["software_brightness"] = self.software_brightness
         if self.auto_shutdown:
             d["auto_shutdown"] = True
+        if self.send_latency_ms:
+            d["send_latency_ms"] = self.send_latency_ms
+        if self.rgbw:
+            d["rgbw"] = True
         return d
 
     @classmethod
@@ -84,6 +92,8 @@ class Device:
             baud_rate=data.get("baud_rate"),
             software_brightness=data.get("software_brightness", 255),
             auto_shutdown=data.get("auto_shutdown", False),
+            send_latency_ms=data.get("send_latency_ms", 0),
+            rgbw=data.get("rgbw", False),
             created_at=datetime.fromisoformat(data.get("created_at", datetime.utcnow().isoformat())),
             updated_at=datetime.fromisoformat(data.get("updated_at", datetime.utcnow().isoformat())),
         )
@@ -180,6 +190,8 @@ class DeviceStore:
         device_type: str = "wled",
         baud_rate: Optional[int] = None,
         auto_shutdown: bool = False,
+        send_latency_ms: int = 0,
+        rgbw: bool = False,
     ) -> Device:
         """Create a new device."""
         device_id = f"device_{uuid.uuid4().hex[:8]}"
@@ -192,6 +204,8 @@ class DeviceStore:
             device_type=device_type,
             baud_rate=baud_rate,
             auto_shutdown=auto_shutdown,
+            send_latency_ms=send_latency_ms,
+            rgbw=rgbw,
         )
 
         self._devices[device_id] = device
@@ -217,6 +231,8 @@ class DeviceStore:
         enabled: Optional[bool] = None,
         baud_rate: Optional[int] = None,
         auto_shutdown: Optional[bool] = None,
+        send_latency_ms: Optional[int] = None,
+        rgbw: Optional[bool] = None,
     ) -> Device:
         """Update device."""
         device = self._devices.get(device_id)
@@ -235,6 +251,10 @@ class DeviceStore:
             device.baud_rate = baud_rate
         if auto_shutdown is not None:
             device.auto_shutdown = auto_shutdown
+        if send_latency_ms is not None:
+            device.send_latency_ms = send_latency_ms
+        if rgbw is not None:
+            device.rgbw = rgbw
 
         device.updated_at = datetime.utcnow()
         self.save()