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/test_config.py

@@ -1,10 +1,9 @@
 """Tests for configuration management."""
 
-
 import pytest
 import yaml
 
-from wled_controller.config import (
+from ledgrab.config import (
     Config,
     ServerConfig,
     get_config,
@@ -54,8 +53,8 @@ class TestFromYaml:
 
 class TestEnvironmentVariables:
     def test_env_overrides(self, monkeypatch):
-        monkeypatch.setenv("WLED_SERVER__HOST", "192.168.1.1")
-        monkeypatch.setenv("WLED_SERVER__PORT", "7000")
+        monkeypatch.setenv("LEDGRAB_SERVER__HOST", "192.168.1.1")
+        monkeypatch.setenv("LEDGRAB_SERVER__PORT", "7000")
         config = Config()
         assert config.server.host == "192.168.1.1"
         assert config.server.port == 7000