Extract dashboard into standalone ds4_dashboard module#400
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This commit extracts the real-time web dashboard from ds4_server.c into a self-contained ds4_dashboard module (ds4_dashboard.h + ds4_dashboard.c). The module provides: - A live HTML dashboard page served at /dashboard (or /) - JSON endpoints for /metrics, /status, /config - Real-time model status (idle/prefilling/thinking/generating) - Prefill progress bar with ETA countdown - Live generation output preview (last ~200 chars) - Cumulative cache hit rate tracking - Incremental prefill speed (uncached tokens only) - Startup configuration display - Persistent metrics saved to metrics.json in the KV disk directory The module has zero internal dependencies - only POSIX socket I/O and standard C. It can be reused by other projects embedding ds4-server's HTTP interface. ds4_server.c is minimally modified: - Remove ~530 lines of inline dashboard code - Add a void *dash handle to struct server - Replace all s->metrics / s->status / HTTP endpoint code with calls to the ds4_dashboard API - Initialize, persist, and free the dashboard at startup/shutdown
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Extracts the dashboard into a self-contained module