Add geo suspect detection API, UI download flow, and tests

[rad1092]

Motivation

• Provide a lightweight, map-independent workflow to detect and extract suspicious geo records from CSV/Excel/document inputs.
• Clearly separate suspect categories: missing/non-numeric coords, out-of-range coords, and large consecutive movement (distance threshold).
• Produce stable tabular artifacts (CSV/JSON) and optional GeoJSON so downstream tooling or manual review can consume results without map/tile dependencies.

Description

• Add bitnet_tools/geo.py implementing validate_lat_lon(lat, lon), haversine_km(...), and flag_geo_suspects(rows, lat_col, lon_col, threshold_km=25) and exposing reason constants (MISSING_OR_NON_NUMERIC, OUT_OF_RANGE, DISTANCE_THRESHOLD_EXCEEDED).
• Extend bitnet_tools/web.py with helper functions (_rows_from_csv_text, _build_geojson_feature_collection, _write_geo_suspect_artifacts) and a new endpoint POST /api/geo/suspects that accepts column names and threshold and returns counts, inline rows (optional), and artifact paths (CSV/JSON, optional GeoJSON).
• Ensure artifact outputs always include is_suspect, suspect_reason, and distance_km columns and persist artifacts under .bitnet_cache/geo_suspects/....
• Add a minimal UI section in bitnet_tools/ui/index.html and wire frontend logic in bitnet_tools/ui/app.js to collect parameters and trigger the /api/geo/suspects call, showing a download/artifact summary without rendering any map tiles.
• Add tests: tests/test_geo.py verifies range checks, Haversine scale, missing/non-numeric handling and distance-threshold behavior; tests/test_web.py extended with API success/error contract checks for /api/geo/suspects.

Testing

• Ran unit/integration tests with pytest -q tests/test_geo.py tests/test_web.py tests/test_ui_contract.py and all tests passed (20 passed).
• The new API and UI flow are covered by the added tests in tests/test_geo.py and the extended assertions in tests/test_web.py.

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve zero threshold values in geo suspects API

The threshold parsing uses float(payload.get('threshold_km', 25) or 25), which treats a valid numeric 0 as falsy and silently replaces it with 25. This changes user-requested behavior: when the client sends threshold_km: 0 (the UI allows this with min="0"), distances below 25 km are not flagged even though the request asked for a zero-distance cutoff.

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