BE001: Ensure Product Detail API response matches frontend contract and passes schema validation

[Aarya1801]

Ticket

• BE001

Description

-Reviewed and updated the map_enriched_to_product_detail.py mapping function to ensure the Product Detail API response strictly matches the agreed JSON contract (api/contracts/product_v1.json) used by the frontend.
-Enforced presence, type, and default values for all required and optional fields in the API response, including arrays, objects, and nullable fields, to guarantee consistent structure for UI rendering.
-Patched the mapping logic to handle missing or null values robustly, ensuring no required field is omitted and all types are correct.
-Renamed the folder database/clean data to database/clean_data and updated all relevant import paths and file references for Python module compatibility.
-Fixed import statements in the mapping and related scripts to use the new clean_data path.
-Ran the schema validation script (scripts/schema_validate_harness.py) on 50 sample products to automatically verify contract compliance.
-Validation result: 0 errors, confirming the API response is fully compliant with the frontend contract.

Checks

• All requirements of the ticket have been implemented, or I have commented on any exclusions
• Unit tests have been added or updated for any backend changes (if applicable)
• I have reviewed the Files Changed tab and verified it only contains relevant changes (comment if unsure about any)
• This PR has been reviewed and approved

Screenshots