refactor: rename project to LedGrab, split HA integration into separate repo

- Rename Python package: wled_controller -> ledgrab
- Rename env var prefix: WLED_ -> LEDGRAB_ (with auto-migration for old vars)
- Rename localStorage key: wled_api_key -> ledgrab_api_key (with migration)
- Rename HA integration domain: wled_screen_controller -> ledgrab
- Update all imports, build scripts, Docker, installer, config, docs
- Remove HA integration (moved to ledgrab-haos-integration repo)
- Remove hacs.json (belongs in HA repo now)
- Add startup warning for users with old WLED_ env vars
- All tests pass (715/715), ruff clean, tsc clean, frontend builds

server/scripts/restart-server.bat

@@ -1,8 +1,8 @@
 @echo off
-REM WLED Screen Controller Restart Script
+REM LedGrab Restart Script
 REM This script restarts the WLED screen controller server
 
-echo Restarting WLED Screen Controller...
+echo Restarting LedGrab...
 echo.
 
 REM Stop the server first
@@ -18,7 +18,7 @@ cd /d "%~dp0\.."
 REM Start the server
 echo.
 echo [2/2] Starting server...
-python -m wled_controller
+python -m ledgrab
 
 REM If the server exits, pause to show any error messages
 pause