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/Caddyfile

@@ -3,18 +3,25 @@
 }
 
 :80 {
+    # API routes
     handle_path /api/* {
         reverse_proxy app:8080
     }
 
-    handle_path /ws {
-        reverse_proxy app:8080
+    # WebSocket gateway
+    handle /ws {
+        reverse_proxy app:8080 {
+            header_up Connection {>Connection}
+            header_up Upgrade {>Upgrade}
+        }
     }
 
+    # LiveKit (if proxied)
     handle_path /livekit/* {
         reverse_proxy livekit:7880
     }
 
+    # SPA fallback - serve index.html for all other routes
     handle {
         root * /srv/web
         try_files {path} /index.html