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_group_device.py

@@ -3,8 +3,8 @@
 import numpy as np
 import pytest
 
-from wled_controller.storage.database import Database
-from wled_controller.storage.device_store import Device, DeviceStore
+from ledgrab.storage.database import Database
+from ledgrab.storage.device_store import Device, DeviceStore
 
 
 # ── Fixtures ──────────────────────────────────────────────────────────
@@ -240,7 +240,7 @@ class TestGroupLEDClient:
 
     @pytest.mark.asyncio
     async def test_connect_creates_children(self, mock_store):
-        from wled_controller.core.devices.group_client import GroupLEDClient
+        from ledgrab.core.devices.group_client import GroupLEDClient
 
         store, devices = mock_store
         client = GroupLEDClient(
@@ -257,7 +257,7 @@ class TestGroupLEDClient:
 
     @pytest.mark.asyncio
     async def test_sequence_mode_slices(self, mock_store):
-        from wled_controller.core.devices.group_client import GroupLEDClient
+        from ledgrab.core.devices.group_client import GroupLEDClient
 
         store, devices = mock_store
         client = GroupLEDClient(
@@ -292,7 +292,7 @@ class TestGroupLEDClient:
 
     @pytest.mark.asyncio
     async def test_independent_mode_resamples(self, mock_store):
-        from wled_controller.core.devices.group_client import GroupLEDClient
+        from ledgrab.core.devices.group_client import GroupLEDClient
 
         store, devices = mock_store
         client = GroupLEDClient(
@@ -328,7 +328,7 @@ class TestGroupLEDClient:
 
     @pytest.mark.asyncio
     async def test_close_cleans_up(self, mock_store):
-        from wled_controller.core.devices.group_client import GroupLEDClient
+        from ledgrab.core.devices.group_client import GroupLEDClient
 
         store, devices = mock_store
         client = GroupLEDClient(
@@ -345,7 +345,7 @@ class TestGroupLEDClient:
 
     @pytest.mark.asyncio
     async def test_sequence_pads_short_pixels(self, mock_store):
-        from wled_controller.core.devices.group_client import GroupLEDClient
+        from ledgrab.core.devices.group_client import GroupLEDClient
 
         store, devices = mock_store
         client = GroupLEDClient(