Initial commit — DRB client (edge node) stack

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

.env.example

@@ -0,0 +1,26 @@
+# Node Identity
+NODE_ID=node-001
+NODE_NAME="My Radio Node"
+NODE_LAT=0.0
+NODE_LON=0.0
+
+# MQTT — point to your C2 server
+MQTT_BROKER=localhost
+MQTT_PORT=1883
+MQTT_USER=
+MQTT_PASS=
+
+# C2 server for audio upload (leave blank to disable upload)
+C2_URL=http://localhost:8888
+# API key is provisioned automatically via MQTT after admin approves the node
+
+# Icecast (local container — usually no need to change)
+ICECAST_SOURCE_PASSWORD=hackme
+ICECAST_ADMIN_PASSWORD=admin
+ICECAST_HOST=localhost
+ICECAST_PORT=8000
+ICECAST_MOUNT=/radio
+
+# OP25 container (usually no need to change)
+OP25_API_URL=http://localhost:8001
+OP25_TERMINAL_URL=http://localhost:8081