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/static/locales/en.json

@@ -32,6 +32,61 @@
   "displays.loading": "Loading displays...",
   "displays.none": "No displays available",
   "displays.failed": "Failed to load displays",
+  "templates.title": "\uD83C\uDFAF Capture Templates",
+  "templates.description": "Capture templates define how the screen is captured. Each template uses a specific capture engine (MSS, DXcam, WGC) with custom settings. Assign templates to devices for optimal performance.",
+  "templates.loading": "Loading templates...",
+  "templates.empty": "No capture templates configured",
+  "templates.add": "Add Capture Template",
+  "templates.edit": "Edit Capture Template",
+  "templates.name": "Template Name:",
+  "templates.name.placeholder": "My Custom Template",
+  "templates.description.label": "Description (optional):",
+  "templates.description.placeholder": "Describe this template...",
+  "templates.engine": "Capture Engine:",
+  "templates.engine.select": "Select an engine...",
+  "templates.engine.unavailable": "Unavailable",
+  "templates.engine.unavailable.hint": "This engine is not available on your system",
+  "templates.config": "Engine Configuration",
+  "templates.config.show": "Show configuration",
+  "templates.config.none": "No additional configuration",
+  "templates.config.default": "Default",
+  "templates.default": "Default",
+  "templates.custom": "Custom Templates",
+  "templates.default.locked": "Default template (cannot edit/delete)",
+  "templates.created": "Template created successfully",
+  "templates.updated": "Template updated successfully",
+  "templates.deleted": "Template deleted successfully",
+  "templates.delete.confirm": "Are you sure you want to delete this template?",
+  "templates.error.load": "Failed to load templates",
+  "templates.error.engines": "Failed to load engines",
+  "templates.error.required": "Please fill in all required fields",
+  "templates.error.delete": "Failed to delete template",
+  "templates.test.title": "Test Capture",
+  "templates.test.description": "Test this template before saving to see a capture preview and performance metrics.",
+  "templates.test.display": "Display:",
+  "templates.test.display.select": "Select display...",
+  "templates.test.duration": "Capture Duration (s):",
+  "templates.test.border_width": "Border Width (px):",
+  "templates.test.run": "\uD83E\uDDEA Run Test",
+  "templates.test.running": "Running test...",
+  "templates.test.results.preview": "Full Capture Preview",
+  "templates.test.results.borders": "Border Extraction",
+  "templates.test.results.top": "Top",
+  "templates.test.results.right": "Right",
+  "templates.test.results.bottom": "Bottom",
+  "templates.test.results.left": "Left",
+  "templates.test.results.performance": "Performance",
+  "templates.test.results.capture_time": "Capture",
+  "templates.test.results.extraction_time": "Extraction",
+  "templates.test.results.total_time": "Total",
+  "templates.test.results.max_fps": "Max FPS",
+  "templates.test.results.duration": "Duration",
+  "templates.test.results.frame_count": "Frames",
+  "templates.test.results.actual_fps": "Actual FPS",
+  "templates.test.results.avg_capture_time": "Avg Capture",
+  "templates.test.error.no_engine": "Please select a capture engine",
+  "templates.test.error.no_display": "Please select a display",
+  "templates.test.error.failed": "Test failed",
   "devices.title": "\uD83D\uDCA1 Devices",
   "devices.add": "Add New Device",
   "devices.loading": "Loading devices...",
@@ -54,7 +109,8 @@
   "device.button.add": "Add Device",
   "device.button.start": "Start",
   "device.button.stop": "Stop",
-  "device.button.settings": "Settings",
+  "device.button.settings": "General Settings",
+  "device.button.capture_settings": "Capture Settings",
   "device.button.calibrate": "Calibrate",
   "device.button.remove": "Remove",
   "device.button.webui": "Open WLED Web UI",
@@ -81,16 +137,23 @@
   "device.tip.metadata": "Device info (LED count, type, color channels) is auto-detected from WLED",
   "device.tip.brightness": "Slide to adjust device brightness",
   "device.tip.start": "Start or stop screen capture processing",
-  "device.tip.settings": "Configure device settings (display, FPS, health check)",
+  "device.tip.settings": "Configure general device settings (name, URL, health check)",
+  "device.tip.capture_settings": "Configure capture settings (display, capture template)",
   "device.tip.calibrate": "Calibrate LED positions, direction, and coverage",
   "device.tip.webui": "Open WLED's built-in web interface for advanced configuration",
   "device.tip.add": "Click here to add a new WLED device",
   "settings.title": "Device Settings",
+  "settings.general.title": "General Settings",
+  "settings.capture.title": "Capture Settings",
+  "settings.capture.saved": "Capture settings updated",
+  "settings.capture.failed": "Failed to save capture settings",
   "settings.brightness": "Brightness:",
   "settings.brightness.hint": "Global brightness for this WLED device (0-100%)",
   "settings.url.hint": "IP address or hostname of your WLED device",
   "settings.display_index": "Display:",
   "settings.display_index.hint": "Which screen to capture for this device",
+  "settings.capture_template": "Capture Template:",
+  "settings.capture_template.hint": "Screen capture engine and configuration for this device",
   "settings.button.cancel": "Cancel",
   "settings.health_interval": "Health Check Interval (s):",
   "settings.health_interval.hint": "How often to check the WLED device status (5-600 seconds)",