Initial commit: WLED Screen Controller with FastAPI server and Home Assistant integration

This is a complete WLED ambient lighting controller that captures screen border pixels
and sends them to WLED devices for immersive ambient lighting effects.

## Server Features:
- FastAPI-based REST API with 17+ endpoints
- Real-time screen capture with multi-monitor support
- Advanced LED calibration system with visual GUI
- API key authentication with labeled tokens
- Per-device brightness control (0-100%)
- Configurable FPS (1-60), border width, and color correction
- Persistent device storage (JSON-based)
- Comprehensive Web UI with dark/light themes
- Docker support with docker-compose
- Windows monitor name detection via WMI (shows "LG ULTRAWIDE" etc.)

## Web UI Features:
- Device management (add, configure, remove WLED devices)
- Real-time status monitoring with FPS metrics
- Settings modal for device configuration
- Visual calibration GUI with edge testing
- Brightness slider per device
- Display selection with friendly monitor names
- Token-based authentication with login/logout
- Responsive button layout

## Calibration System:
- Support for any LED strip layout (clockwise/counterclockwise)
- 4 starting position options (corners)
- Per-edge LED count configuration
- Visual preview with starting position indicator
- Test buttons to light up individual edges
- Smart LED ordering based on start position and direction

## Home Assistant Integration:
- Custom HACS integration
- Switch entities for processing control
- Sensor entities for status and FPS
- Select entities for display selection
- Config flow for easy setup
- Auto-discovery of devices from server

## Technical Stack:
- Python 3.11+
- FastAPI + uvicorn
- mss (screen capture)
- httpx (async WLED client)
- Pydantic (validation)
- WMI (Windows monitor detection)
- Structlog (logging)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

server/tests/conftest.py

@@ -0,0 +1,49 @@
+"""Pytest configuration and fixtures."""
+
+import pytest
+from pathlib import Path
+
+
+@pytest.fixture
+def test_data_dir(tmp_path):
+    """Provide a temporary directory for test data."""
+    return tmp_path / "data"
+
+
+@pytest.fixture
+def test_config_dir(tmp_path):
+    """Provide a temporary directory for test configuration."""
+    return tmp_path / "config"
+
+
+@pytest.fixture
+def sample_calibration():
+    """Provide a sample calibration configuration."""
+    return {
+        "layout": "clockwise",
+        "start_position": "bottom_left",
+        "segments": [
+            {"edge": "bottom", "led_start": 0, "led_count": 40, "reverse": False},
+            {"edge": "right", "led_start": 40, "led_count": 30, "reverse": False},
+            {"edge": "top", "led_start": 70, "led_count": 40, "reverse": True},
+            {"edge": "left", "led_start": 110, "led_count": 40, "reverse": True},
+        ],
+    }
+
+
+@pytest.fixture
+def sample_device():
+    """Provide a sample device configuration."""
+    return {
+        "id": "test_device_001",
+        "name": "Test WLED Device",
+        "url": "http://192.168.1.100",
+        "led_count": 150,
+        "enabled": True,
+        "settings": {
+            "display_index": 0,
+            "fps": 30,
+            "border_width": 10,
+            "brightness": 0.8,
+        },
+    }