Goal Centralize payload translation so UI internals can stay camelCase while API requests always match backend validation. Scope - Create mapper layer for API payloads: base_path - Create mapper layer for endpoint payloads: api_id, is_active, request_schema, response_schema, execution_plan, response_mapping - Apply to create+update paths - Normalize backend responses back into UI model Acceptance Criteria - No 400 validation failures due to key naming mismatch - Create/update API and endpoint paths succeed via same mapper Candidate files - src/app/adf-api-builder/services/api-builder-mapper.service.ts - src/app/adf-api-builder/df-api-builder-page.component.ts