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.ps1

@@ -58,7 +58,7 @@ if (-not $Version) {
 }
 if (-not $Version) {
     # Parse from __init__.py
-    $initFile = Join-Path $ServerDir "src\wled_controller\__init__.py"
+    $initFile = Join-Path $ServerDir "src\ledgrab\__init__.py"
     $match = Select-String -Path $initFile -Pattern '__version__\s*=\s*"([^"]+)"'
     if ($match) { $Version = $match.Matches[0].Groups[1].Value }
 }
@@ -107,7 +107,7 @@ if ($pthContent -notmatch 'Lib\\site-packages') {
     $pthContent = $pthContent.TrimEnd() + "`nLib\site-packages`n"
 }
 # Embedded Python ._pth overrides PYTHONPATH, so add the app source path
-# directly for wled_controller to be importable
+# directly for ledgrab to be importable
 if ($pthContent -notmatch '\.\.[/\\]app[/\\]src') {
     $pthContent = $pthContent.TrimEnd() + "`n..\app\src`n"
 }
@@ -144,10 +144,10 @@ if ($LASTEXITCODE -ne 0) {
     Write-Host "  Some optional deps may have failed (continuing)..." -ForegroundColor Yellow
 }
 
-# Remove the installed wled_controller package to avoid duplication
+# Remove the installed ledgrab package to avoid duplication
 $sitePackages = Join-Path $PythonDir "Lib\site-packages"
-Get-ChildItem -Path $sitePackages -Filter "wled*" -Directory | Remove-Item -Recurse -Force -ErrorAction SilentlyContinue
-Get-ChildItem -Path $sitePackages -Filter "wled*.dist-info" -Directory | Remove-Item -Recurse -Force -ErrorAction SilentlyContinue
+Get-ChildItem -Path $sitePackages -Filter "ledgrab*" -Directory | Remove-Item -Recurse -Force -ErrorAction SilentlyContinue
+Get-ChildItem -Path $sitePackages -Filter "ledgrab*.dist-info" -Directory | Remove-Item -Recurse -Force -ErrorAction SilentlyContinue
 
 # Clean up caches and test files to reduce size
 Write-Host "  Cleaning up caches..."
@@ -206,14 +206,14 @@ 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
 '@
 
 $launcherContent = $launcherContent -replace '%VERSION%', $VersionClean