Add per-target protocol selection (DDP/HTTP) and reorganize target editor

- Add protocol field (ddp/http) to storage, API schemas, routes, processor
- WledTargetProcessor passes protocol to create_led_client(use_ddp=...)
- Target editor: protocol dropdown + keepalive in collapsible Specific Settings
- FPS, brightness threshold, adaptive FPS moved to main form area
- Hide Specific Settings section for serial devices (protocol is WLED-only)
- Card badge: show DDP/HTTP for WLED devices, Serial for serial devices

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

server/src/wled_controller/core/processing/processor_manager.py

@@ -323,6 +323,7 @@ class ProcessorManager:
         brightness_value_source_id: str = "",
         min_brightness_threshold: int = 0,
         adaptive_fps: bool = False,
+        protocol: str = "ddp",
     ):
         """Register a WLED target processor."""
         if target_id in self._processors:
@@ -340,6 +341,7 @@ class ProcessorManager:
             brightness_value_source_id=brightness_value_source_id,
             min_brightness_threshold=min_brightness_threshold,
             adaptive_fps=adaptive_fps,
+            protocol=protocol,
             ctx=self._build_context(),
         )
         self._processors[target_id] = proc

server/src/wled_controller/core/processing/wled_target_processor.py

@@ -39,6 +39,7 @@ class WledTargetProcessor(TargetProcessor):
         brightness_value_source_id: str = "",
         min_brightness_threshold: int = 0,
         adaptive_fps: bool = False,
+        protocol: str = "ddp",
         ctx: TargetContext = None,
     ):
         super().__init__(target_id, ctx)
@@ -50,6 +51,7 @@ class WledTargetProcessor(TargetProcessor):
         self._brightness_vs_id = brightness_value_source_id
         self._min_brightness_threshold = min_brightness_threshold
         self._adaptive_fps = adaptive_fps
+        self._protocol = protocol
 
         # Adaptive FPS / liveness probe runtime state
         self._effective_fps: int = self._target_fps
@@ -95,7 +97,7 @@ class WledTargetProcessor(TargetProcessor):
         try:
             self._led_client = create_led_client(
                 device_info.device_type, device_info.device_url,
-                use_ddp=True, led_count=device_info.led_count,
+                use_ddp=(self._protocol == "ddp"), led_count=device_info.led_count,
                 baud_rate=device_info.baud_rate,
                 send_latency_ms=device_info.send_latency_ms,
                 rgbw=device_info.rgbw,
@@ -373,6 +375,7 @@ class WledTargetProcessor(TargetProcessor):
             "errors": [metrics.last_error] if metrics.last_error else [],
             "device_streaming_reachable": self._device_reachable if self._is_running else None,
             "fps_effective": self._effective_fps if self._is_running else None,
+            "protocol": self._protocol,
         }
 
     def get_metrics(self) -> dict: