fix: resolve all 153 ruff lint errors for CI

Auto-fixed 138 unused imports and f-string issues. Manually fixed:
ambiguous variable names (l→layer), availability-check imports using
importlib.util.find_spec, unused Color import, ImagePool forward ref
via TYPE_CHECKING, multi-statement semicolons, and E402 suppression.

server/tests/api/routes/test_devices_routes.py

@@ -4,8 +4,7 @@ These tests exercise the FastAPI route handlers using dependency override
 to inject test stores, avoiding real hardware dependencies.
 """
 
-from datetime import datetime, timezone
-from unittest.mock import AsyncMock, MagicMock, patch
+from unittest.mock import AsyncMock, MagicMock
 
 import pytest
 from fastapi import FastAPI

server/tests/api/routes/test_webhooks_routes.py

@@ -1,7 +1,6 @@
 """Tests for webhook routes — trigger, validation, rate limiting."""
 
 import time
-from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 

server/tests/conftest.py

@@ -1,10 +1,6 @@
 """Pytest configuration and shared fixtures."""
 
-import json
-import os
 from datetime import datetime, timezone
-from pathlib import Path
-from unittest.mock import AsyncMock, MagicMock
 
 import pytest
 
@@ -15,11 +11,8 @@ from wled_controller.storage.sync_clock_store import SyncClockStore
 from wled_controller.storage.output_target_store import OutputTargetStore
 from wled_controller.storage.automation import (
     Automation,
-    AlwaysCondition,
-    WebhookCondition,
 )
 from wled_controller.storage.automation_store import AutomationStore
-from wled_controller.storage.value_source import StaticValueSource, ValueSource
 from wled_controller.storage.value_source_store import ValueSourceStore
 
 

server/tests/core/test_automation_engine.py

@@ -1,8 +1,7 @@
 """Tests for AutomationEngine — condition evaluation in isolation."""
 
-import asyncio
 from datetime import datetime, timezone
-from unittest.mock import AsyncMock, MagicMock, patch
+from unittest.mock import MagicMock, patch
 
 import pytest
 
@@ -12,7 +11,6 @@ from wled_controller.storage.automation import (
     ApplicationCondition,
     Automation,
     DisplayStateCondition,
-    MQTTCondition,
     StartupCondition,
     SystemIdleCondition,
     TimeOfDayCondition,

server/tests/core/test_sync_clock_runtime.py

@@ -3,7 +3,6 @@
 import threading
 import time
 
-import pytest
 
 from wled_controller.core.processing.sync_clock_runtime import SyncClockRuntime
 

server/tests/e2e/test_auth_flow.py

@@ -7,9 +7,7 @@ Uses the `client` fixture (which has the correct auth header set), and
 helpers to make unauthenticated requests by temporarily removing the header.
 """
 
-import pytest
 
-from tests.e2e.conftest import API_KEY
 
 
 def _unauth_get(client, url):

server/tests/e2e/test_backup_flow.py

@@ -6,7 +6,6 @@ Tests creating entities, backing up, deleting, then restoring from backup.
 import io
 import json
 
-import pytest
 
 
 class TestBackupRestoreFlow:

server/tests/e2e/test_color_strip_flow.py

@@ -3,7 +3,6 @@
 Tests creating, listing, updating, cloning, and deleting color strip sources.
 """
 
-import pytest
 
 
 class TestColorStripSourceLifecycle:

server/tests/e2e/test_device_flow.py

@@ -4,7 +4,6 @@ Tests the complete device lifecycle through the API:
 create -> get -> update -> brightness -> power -> delete -> verify gone.
 """
 
-import pytest
 
 
 class TestDeviceLifecycle:

server/tests/e2e/test_target_flow.py

@@ -4,7 +4,6 @@ Tests target CRUD with a dependency on a device:
 create device -> create target -> list -> update -> delete target -> cleanup device.
 """
 
-import pytest
 
 
 class TestOutputTargetLifecycle:

server/tests/storage/test_base_store.py

@@ -1,7 +1,6 @@
 """Tests for BaseJsonStore — the shared data-layer base class."""
 
 import json
-import threading
 from concurrent.futures import ThreadPoolExecutor, as_completed
 from dataclasses import dataclass
 from pathlib import Path

server/tests/storage/test_device_store.py

@@ -1,6 +1,5 @@
 """Tests for DeviceStore — device CRUD, persistence, name uniqueness, thread safety."""
 
-import threading
 from concurrent.futures import ThreadPoolExecutor, as_completed
 from pathlib import Path
 

server/tests/storage/test_output_target_store.py

@@ -7,7 +7,6 @@ from wled_controller.storage.output_target_store import OutputTargetStore
 from wled_controller.storage.wled_output_target import WledOutputTarget
 from wled_controller.storage.key_colors_output_target import (
     KeyColorsOutputTarget,
-    KeyColorsSettings,
 )
 
 

server/tests/test_api.py

@@ -1,6 +1,5 @@
 """Tests for API endpoints (public + authenticated)."""
 
-import pytest
 from fastapi.testclient import TestClient
 
 from wled_controller.main import app

server/tests/test_config.py

@@ -1,7 +1,5 @@
 """Tests for configuration management."""
 
-import os
-from pathlib import Path
 
 import pytest
 import yaml
@@ -9,13 +7,8 @@ import yaml
 from wled_controller.config import (
     Config,
     ServerConfig,
-    StorageConfig,
-    AuthConfig,
-    MQTTConfig,
-    LoggingConfig,
     get_config,
     reload_config,
-    is_demo_mode,
 )
 
 

server/tests/test_device_store.py

@@ -1,7 +1,6 @@
 """Tests for device storage."""
 
 import pytest
-from pathlib import Path
 
 from wled_controller.storage.device_store import Device, DeviceStore
 

server/tests/test_processor_manager.py

@@ -1,9 +1,6 @@
 """Tests for processor manager."""
 
-import asyncio
 import pytest
-import respx
-from httpx import Response
 
 from wled_controller.core.processing.processor_manager import ProcessorManager
 from wled_controller.core.processing.processing_settings import ProcessingSettings