Initial commit — DRB client (edge node) stack

Includes edge-node (FastAPI/MQTT/Discord voice), op25-container (SDR decoder),
and icecast (audio streaming).

drb-edge-node/app/config.py

@@ -0,0 +1,39 @@
+from pydantic_settings import BaseSettings
+from typing import Optional
+
+
+class Settings(BaseSettings):
+    # Node identity
+    node_id: str
+    node_name: str = "Unnamed Node"
+    node_lat: float = 0.0
+    node_lon: float = 0.0
+
+    # MQTT
+    mqtt_broker: str
+    mqtt_port: int = 1883
+    mqtt_user: Optional[str] = None
+    mqtt_pass: Optional[str] = None
+
+    # C2 server (audio upload destination); None disables upload
+    c2_url: Optional[str] = None
+
+    # Local Icecast
+    icecast_host: str = "localhost"
+    icecast_port: int = 8000
+    icecast_mount: str = "/radio"
+    icecast_source_password: str = "hackme"
+
+    # OP25 container
+    op25_api_url: str = "http://localhost:8001"
+    op25_terminal_url: str = "http://localhost:8081"
+
+    # Paths (volume mounts)
+    config_path: str = "/configs"
+    recordings_path: str = "/recordings"
+
+    class Config:
+        env_file = ".env"
+
+
+settings = Settings()