Add static color support, HAOS light entity, and real-time profile updates

- Add static_color capability to WLED and serial providers with native
  set_color() dispatch (WLED uses JSON API, serial uses idle client)
- Encapsulate device-specific logic in providers instead of device_type
  checks in ProcessorManager and API routes
- Add HAOS light entity for devices with brightness_control + static_color
  (Adalight/AmbiLED get light entity, WLED keeps number entity)
- Fix serial device brightness and turn-off: pass software_brightness
  through provider chain, clear device on color=null, re-send static
  color after brightness change
- Add global events WebSocket (events-ws.js) replacing per-tab WS,
  enabling real-time profile state updates on both dashboard and profiles tabs
- Fix profile activation: mark active when all targets already running,
  add asyncio.Lock to prevent concurrent evaluation races, skip process
  enumeration when no profile has conditions, trigger immediate evaluation
  on enable/create/update for instant target startup
- Add reliable server restart script (restart.ps1)

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

server/restart.ps1

@@ -0,0 +1,26 @@
+# Restart the WLED Screen Controller server
+# Stop any running instance
+$procs = Get-CimInstance Win32_Process -Filter "Name='python.exe'" |
+    Where-Object { $_.CommandLine -like '*wled_controller.main*' }
+foreach ($p in $procs) {
+    Write-Host "Stopping server (PID $($p.ProcessId))..."
+    Stop-Process -Id $p.ProcessId -Force -ErrorAction SilentlyContinue
+}
+if ($procs) { Start-Sleep -Seconds 2 }
+
+# Start server detached
+Write-Host "Starting server..."
+Start-Process -FilePath python -ArgumentList '-m', 'wled_controller.main' `
+    -WorkingDirectory 'c:\Users\Alexei\Documents\wled-screen-controller\server' `
+    -WindowStyle Hidden
+
+Start-Sleep -Seconds 3
+
+# Verify it's running
+$check = Get-CimInstance Win32_Process -Filter "Name='python.exe'" |
+    Where-Object { $_.CommandLine -like '*wled_controller.main*' }
+if ($check) {
+    Write-Host "Server started (PID $($check[0].ProcessId))"
+} else {
+    Write-Host "WARNING: Server does not appear to be running!"
+}