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/routers/ui.py

@@ -0,0 +1,12 @@
+from pathlib import Path
+from fastapi import APIRouter
+from fastapi.responses import HTMLResponse
+
+router = APIRouter(tags=["ui"])
+
+_TEMPLATE = Path(__file__).parent.parent / "templates" / "index.html"
+
+
+@router.get("/", response_class=HTMLResponse)
+async def index():
+    return _TEMPLATE.read_text()