Phase 1 MVP: gateway, CRUD handlers, frontend components

Backend:
- WebSocket gateway (hub, client, events) with fanout broadcast
- Server CRUD handlers (create, list, get, update, delete)
- Channel CRUD handlers (create, list, get, update, delete)
- Message CRUD handlers (list with cursor pagination, create, update, delete)
- cmd/migrate standalone migration CLI (up/down)
- cmd/server wired to all handlers + WebSocket + static file serving

Frontend:
- Zustand stores: auth, server, channel, message, websocket
- API client with fetch wrapper
- Terminal-styled components: Layout, LoginForm, ChatArea, ChannelList, ServerBar, MemberList
- React Router with login and main routes
- Gruvbox dark palette throughout

Ops:
- Docker Compose with app service (multi-stage build)
- Caddyfile with WebSocket upgrade support
- Makefile for common tasks

docker/Dockerfile

@@ -2,13 +2,14 @@ FROM golang:1.24-alpine AS go-builder
 WORKDIR /app
 COPY go.mod go.sum ./
 RUN go mod download
-COPY . .
+COPY cmd/ cmd/
+COPY internal/ internal/
 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
+RUN npm ci --include=dev
 COPY web/ .
 RUN npm run build