feat(spectypes): add support for PostGIS and pgvector types

* Implement custom types: SqlGeometry, SqlGeography, SqlHalfVector, SqlSparseVector, SqlBitVector
* Add spatial filter operators and vector similarity operators
* Include metadata and OpenAPI reporting for geometry/vector column types
* Create tests for EWKB and WKT conversions

pkg/openapi/generator.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 
 	"github.com/bitechdev/ResolveSpec/pkg/modelregistry"
+	"github.com/bitechdev/ResolveSpec/pkg/spectypes"
 )
 
 // OpenAPISpec represents the OpenAPI 3.0 specification structure
@@ -440,6 +441,28 @@ func (g *Generator) generatePropertySchema(field reflect.StructField) *Schema {
 		schema.Description = desc
 	}
 
+	// spectypes PostGIS / pgvector wrappers get dedicated schemas.
+	if n, ok := spectypes.SQLTypeName(field.Type); ok {
+		switch n {
+		case "geometry", "geography":
+			schema.Type = "object"
+			schema.Format = "geojson"
+			return schema
+		case "vector", "halfvec":
+			schema.Type = "array"
+			schema.Items = &Schema{Type: "number"}
+			schema.Format = "vector"
+			return schema
+		case "sparsevec":
+			schema.Type = "object"
+			schema.Format = "sparsevec"
+			return schema
+		case "bit":
+			schema.Type = "string"
+			return schema
+		}
+	}
+
 	switch fieldType.Kind() {
 	case reflect.String:
 		schema.Type = "string"