Add dedicated JSON API endpoints (api_backlink, api_gap) returning full result sets for external clients

Single-read parquet load + boot timing prints (fix stuck startup on throttled CPU)

Run edges warm-up in background thread so Gradio port binds immediately (fixes stuck APP_STARTING)

Fix OOM: drop DuckDB vertices table, serve all attrs from low-memory id-indexed Arrow/numpy arrays

Replace O(N) SQL join with O(k) numpy/Arrow positional array lookup (real bottleneck fix)

Add process-wide query cache + one-click CSV auto-download via DownloadButton

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