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

build-dist-windows.sh

@@ -66,7 +66,7 @@ if ! grep -q 'Lib\\site-packages' "$PTH_FILE"; then
     echo 'Lib\site-packages' >> "$PTH_FILE"
 fi
 # Embedded Python ._pth overrides PYTHONPATH, so we must add the app
-# source directory here for wled_controller to be importable
+# source directory here for ledgrab to be importable
 if ! grep -q '\.\./app/src' "$PTH_FILE"; then
     echo '../app/src' >> "$PTH_FILE"
 fi
@@ -325,14 +325,14 @@ cd /d "%~dp0"
 
 :: Set paths
 set PYTHONPATH=%~dp0app\src
-set WLED_CONFIG_PATH=%~dp0app\config\default_config.yaml
+set LEDGRAB_CONFIG_PATH=%~dp0app\config\default_config.yaml
 
 :: Create data directory if missing
 if not exist "%~dp0data" mkdir "%~dp0data"
 if not exist "%~dp0logs" mkdir "%~dp0logs"
 
 :: Start the server (tray icon handles UI and exit)
-"%~dp0python\pythonw.exe" -m wled_controller
+"%~dp0python\pythonw.exe" -m ledgrab
 LAUNCHER
 
 # Convert launcher to Windows line endings