Initial GeoIntel V1 foundation

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+# Geometry Contracts
+
+## Internal Geometry Standard
+- Database geometries are stored in PostGIS.
+- Default storage CRS: EPSG:31370 for Belgian projected operations where appropriate, or EPSG:4326 for API interchange.
+- API GeoJSON is always EPSG:4326 unless explicitly stated.
+- Area calculations must use projected CRS, not raw WGS84 degrees.
+
+## Accepted Area Input
+- GeoJSON Polygon
+- GeoJSON MultiPolygon
+- drawn polygon from frontend
+- future: municipality selection
+
+## Validation Rules
+- polygon must be closed;
+- polygon must be valid;
+- polygon must have non-zero area;
+- self-intersections must be rejected or repaired explicitly;
+- extremely large areas must require confirmation or be rejected by configured max area.
+
+## Output Rules
+- include `crs` metadata if transformed;
+- include computed area in square meters;
+- include bounds;
+- include geometry validity status.
+
+## Common Trap
+Never compute area or distance in degrees.