Add .env support for transport and sound device configuration

- Add python-dotenv support to control_server.py and sound.py
- Load TRANSPORT from environment variable (default: spi)
- Load AUDIO_INPUT_DEVICE from environment variable (default: 7)
- Load all port configurations from environment variables
- Update .env.example with comprehensive configuration options
- Create .env file with sensible defaults for Pi
- Transport, sound device, and network settings now configurable via .env

src/control_server.py

@@ -13,17 +13,22 @@ import socket
 import threading
 import time
 import argparse
+import os
+from dotenv import load_dotenv
 from bar_config import LED_BAR_NAMES, DEFAULT_BAR_SETTINGS
 from color_utils import adjust_brightness
 from networking import SPIClient, WebSocketClient
 
+# Load environment variables from .env file
+load_dotenv()
+
 # Configure logging
 logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
 
 # Configuration
-CONTROL_SERVER_PORT = 8765
-SOUND_CONTROL_HOST = "127.0.0.1"
-SOUND_CONTROL_PORT = 65433
+CONTROL_SERVER_PORT = int(os.getenv("CONTROL_SERVER_PORT", "8765"))
+SOUND_CONTROL_HOST = os.getenv("SOUND_CONTROL_HOST", "127.0.0.1")
+SOUND_CONTROL_PORT = int(os.getenv("SOUND_CONTROL_PORT", "65433"))
 
 # Pattern name mapping for shorter JSON payloads
 PATTERN_NAMES = {
@@ -463,11 +468,12 @@ def parse_arguments():
     
     # Transport selection
     transport_group = parser.add_argument_group("Transport Options")
+    default_transport = os.getenv("TRANSPORT", "spi")
     transport_group.add_argument(
         "--transport", 
         choices=["spi", "websocket"], 
-        default="spi",
-        help="Transport method for LED communication (default: spi)"
+        default=default_transport,
+        help=f"Transport method for LED communication (default from .env or {default_transport})"
     )
     
     # Control options