Replace full docker compose rebuild during development with:
- pnpm dev / dev:backend (air hot-reload control-plane) / dev:frontend (vite HMR) / dev:deps
- compose.dev.yaml: postgres+docker-gateway only, host port mapping (5432/8081), container control-plane disabled via profile
- scripts/dev-backend.mjs: read .env, fill dev defaults (login admin/admin123, listen :8082, 32-byte dev master key with explicit warning on invalid .env value), ensure dep containers, run air
- vite: fixed port 5173, /api proxy to local control-plane (8082)
- README: document hot-reload dev workflow
Verified: pnpm dev end-to-end (login/API/frontend/proxy 200), Go+JSX edit hot-reload, compose config --quiet, go build ./..., web tests 65 passed, npm --prefix web run build.