Initial commit — DRB server stack

Includes c2-core (FastAPI/MQTT/Firestore), discord-bot (slash commands),
frontend (Next.js admin UI), and mosquitto config.

drb-frontend/middleware.ts

@@ -0,0 +1,20 @@
+import { NextRequest, NextResponse } from "next/server";
+
+export function middleware(request: NextRequest) {
+  const session = request.cookies.get("drb_session");
+  const { pathname } = request.nextUrl;
+
+  if (pathname === "/login") {
+    if (session) return NextResponse.redirect(new URL("/dashboard", request.url));
+    return NextResponse.next();
+  }
+
+  if (!session) {
+    return NextResponse.redirect(new URL("/login", request.url));
+  }
+  return NextResponse.next();
+}
+
+export const config = {
+  matcher: ["/((?!_next/static|_next/image|favicon\\.ico).*)"],
+};