Introduce a developer-only Hydrabase testing UI and backend WebSocket integration. Adds a simple dev-mode toggle (password 'hydratest') and new API endpoints (/api/dev-mode, /api/hydrabase/connect, /api/hydrabase/disconnect, /api/hydrabase/status, /api/hydrabase/send) that use websocket-client to connect/send raw JSON to a Hydrabase instance. Frontend changes include a Hydrabase nav/page, payload editors, response panel, dev-mode UI in Settings, associated JS handlers, CSS styling, and an icon asset. Also add websocket-client to requirements.
Broque Thomas