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/style.css

@@ -1711,6 +1711,24 @@ input:-webkit-autofill:focus {
     gap: 20px;
 }
 
+.templates-separator {
+    grid-column: 1 / -1;
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    color: var(--text-secondary);
+    font-size: 0.85rem;
+    font-weight: 500;
+}
+
+.templates-separator::before,
+.templates-separator::after {
+    content: '';
+    flex: 1;
+    height: 1px;
+    background: var(--border-color);
+}
+
 .template-card {
     background: var(--card-bg);
     border: 1px solid var(--border-color);