/api/v1/mobile/position/

POST https://example.com/api/v1/mobile/position/

Update mobile device position and return nearby threats.

Request body:
{
"lat": 34.05,
"lon": -118.25,
"session_id": "optional-session-id",
"heading": 180, // optional device heading
"radius_nm": 25 // optional threat radius
}

Returns:
{
"session_id": "generated-or-provided-session-id",
"position": {"lat": 34.05, "lon": -118.25},
"threats": [...],
"timestamp": "2024-01-01T00:00:00Z"
}