feat(domains): ✨ add domain support for DrawDB integration

- Introduce Domain and DomainTable models for logical grouping of tables.
- Implement export and import functionality for domains in DrawDB format.
- Update template execution modes to include domain processing.
- Enhance documentation for domain features and usage.

pkg/readers/drawdb/reader.go

@@ -140,6 +140,32 @@ func (r *Reader) convertToDatabase(drawSchema *drawdb.DrawDBSchema) (*models.Dat
 		db.Schemas = append(db.Schemas, schema)
 	}
 
+	// Convert DrawDB subject areas to domains
+	for _, area := range drawSchema.SubjectAreas {
+		domain := models.InitDomain(area.Name)
+
+		// Find all tables that visually belong to this area
+		// A table belongs to an area if its position is within the area bounds
+		for _, drawTable := range drawSchema.Tables {
+			if drawTable.X >= area.X && drawTable.X <= (area.X+area.Width) &&
+				drawTable.Y >= area.Y && drawTable.Y <= (area.Y+area.Height) {
+
+				schemaName := drawTable.Schema
+				if schemaName == "" {
+					schemaName = "public"
+				}
+
+				domainTable := models.InitDomainTable(drawTable.Name, schemaName)
+				domain.Tables = append(domain.Tables, domainTable)
+			}
+		}
+
+		// Only add domain if it has tables
+		if len(domain.Tables) > 0 {
+			db.Domains = append(db.Domains, domain)
+		}
+	}
+
 	return db, nil
 }