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/tests/storage/test_output_target_store.py

@@ -2,9 +2,9 @@
 
 import pytest
 
-from wled_controller.storage.output_target import OutputTarget
-from wled_controller.storage.output_target_store import OutputTargetStore
-from wled_controller.storage.wled_output_target import WledOutputTarget
+from ledgrab.storage.output_target import OutputTarget
+from ledgrab.storage.output_target_store import OutputTargetStore
+from ledgrab.storage.wled_output_target import WledOutputTarget
 
 
 @pytest.fixture
@@ -168,7 +168,7 @@ class TestOutputTargetQueries:
 
 class TestOutputTargetPersistence:
     def test_persist_and_reload(self, tmp_path):
-        from wled_controller.storage.database import Database
+        from ledgrab.storage.database import Database
 
         db_path = str(tmp_path / "ot_persist.db")
         db = Database(db_path)