Add capture template system with in-memory defaults and split device settings UI

- Generate default templates (MSS, DXcam, WGC) in memory from EngineRegistry at startup
- Only persist user-created templates to JSON, skip defaults on load/save
- Add capture_template_id to Device model and DeviceCreate schema
- Remember last used template in localStorage, use it for new devices with fallback
- Split Device Settings dialog into General Settings and Capture Settings
- Add capture settings button (🎬) to device card
- Separate default and custom templates with visual separator in Templates tab
- Add capture engine integration to ProcessorManager
- Add CLAUDE.md with git commit/push policy and server restart instructions
- Add en/ru localization for all new UI elements

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

server/src/wled_controller/api/routes.py

@@ -176,6 +176,7 @@ async def create_device(
     _auth: AuthRequired,
     store: DeviceStore = Depends(get_device_store),
     manager: ProcessorManager = Depends(get_processor_manager),
+    template_store: TemplateStore = Depends(get_template_store),
 ):
     """Create and attach a new WLED device."""
     try:
@@ -214,11 +215,29 @@ async def create_device(
                 detail=f"Failed to connect to WLED device at {device_url}: {e}"
             )
 
+        # Resolve capture template: use requested ID if valid, else first available
+        capture_template_id = None
+        if device_data.capture_template_id:
+            try:
+                template_store.get_template(device_data.capture_template_id)
+                capture_template_id = device_data.capture_template_id
+            except ValueError:
+                logger.warning(
+                    f"Requested template '{device_data.capture_template_id}' not found, using first available"
+                )
+        if not capture_template_id:
+            all_templates = template_store.get_all_templates()
+            if all_templates:
+                capture_template_id = all_templates[0].id
+            else:
+                capture_template_id = "tpl_mss_default"
+
         # Create device in storage (LED count auto-detected from WLED)
         device = store.create_device(
             name=device_data.name,
             url=device_data.url,
             led_count=wled_led_count,
+            capture_template_id=capture_template_id,
         )
 
         # Add to processor manager