Introduce a Hydrabase P2P mirror worker and integrate it into the web UI and server flows. Adds core/hydrabase_worker.py: a background thread with a capped queue (1000), enqueue API, rate limiting, basic stats (sent/dropped/errors), and logic to send JSON requests over a provided WebSocket (responses received and discarded). Integrates the worker into web_server.py (import, startup init, status/pause/resume endpoints, and enqueues queries from multiple search endpoints when dev mode is enabled). Adds UI elements, JavaScript polling/toggle logic, and CSS styling for a Hydrabase status button in webui (index.html, static/script.js, static/style.css) to display and control worker state.
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