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

.env.example

@@ -0,0 +1,12 @@
+# App
+DUMPSTER_HOST=localhost
+DUMPSTER_PORT=8080
+DUMPSTER_SECRET=change...n
+# Database
+POSTGRES_HOST=localhost
+POSTGRES_PORT=5432
+POSTGRES_USER=dumpster
+POSTGRES_PASSWORD=dumpster
+
+# Valkey
+VALKEY_URL=redis://localhost:***@example.com