Initial scaffold: Go backend, React frontend, Docker Compose

- Go backend: config, db (PostgreSQL migrations), auth (argon2id + sessions),
  middleware (cookie sessions, RequireAuth), chi router, cmd/server
- React frontend: Vite + React 18 + TS + Tailwind + Gruvbox palette + terminal CSS
- Docker: compose.yml (Postgres, Valkey, minio, LiveKit, coturn, Caddy),
  livekit.yaml, Caddyfile, Dockerfile (multi-stage Go+Node+Alpine)
- .env.example, .gitignore, README.md

docker/Dockerfile

@@ -0,0 +1,21 @@
+FROM golang:1.24-alpine AS go-builder
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -o /bin/dumpster-server ./cmd/server
+
+FROM node:22-alpine AS web-builder
+WORKDIR /app
+COPY web/package.json web/package-lock.json ./
+RUN npm ci
+COPY web/ .
+RUN npm run build
+
+FROM alpine:latest
+RUN apk --no-cache add ca-certificates
+WORKDIR /app
+COPY --from=go-builder /bin/dumpster-server /app/dumpster-server
+COPY --from=web-builder /app/dist /srv/web
+EXPOSE 8080
+CMD ["/app/dumpster-server"]