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/start-hidden.vbs

@@ -8,13 +8,13 @@ WshShell.CurrentDirectory = appRoot
 ' Set env vars for the child process (inherited via WshShell.Run)
 Set procEnv = WshShell.Environment("Process")
 procEnv("PYTHONPATH") = appRoot & "\app\src"
-procEnv("WLED_CONFIG_PATH") = appRoot & "\app\config\default_config.yaml"
+procEnv("LEDGRAB_CONFIG_PATH") = appRoot & "\app\config\default_config.yaml"
 
 ' Use embedded python.exe (NOT pythonw.exe) with WindowStyle=0.
 ' Same pattern as the Media Server sibling app.
 embeddedPython = appRoot & "\python\python.exe"
 If fso.FileExists(embeddedPython) Then
-    WshShell.Run """" & embeddedPython & """ -m wled_controller", 0, False
+    WshShell.Run """" & embeddedPython & """ -m ledgrab", 0, False
 Else
-    WshShell.Run "python -m wled_controller", 0, False
+    WshShell.Run "python -m ledgrab", 0, False
 End If