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

.gitignore

@@ -0,0 +1,39 @@
+# Binaries
+dumpster-server
+dumpster-tui
+*.exe
+*.dll
+*.so
+*.dylib
+
+# Go
+vendor/
+*.test
+*.out
+coverage.html
+
+# Node
+node_modules/
+dist/
+*.log
+npm-debug.log*
+
+# Environment
+.env
+.env.local
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Docker volumes
+postgres_data/
+valkey_data/
+minio_data/