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/Dockerfile

@@ -0,0 +1,17 @@
+FROM node:20-slim AS builder
+
+WORKDIR /app
+COPY package.json ./
+RUN npm install
+COPY . .
+RUN npm run build
+
+FROM node:20-slim AS runner
+WORKDIR /app
+ENV NODE_ENV=production
+
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+
+EXPOSE 3000
+CMD ["node", "server.js"]