Add Pydantic validation to import_fail_info_bulk endpoint

[viva-jinyi]

Summary

• Regenerated Pydantic models from updated OpenAPI specification using datamodel-codegen
• Updated import_fail_info_bulk route handler to use ImportFailInfoBulkRequest/Response models
• Replaced manual JSON validation with type-safe Pydantic model validation
• Added proper ValidationError handling consistent with other v2 endpoints

Changes

• Data Models: Regenerated all Pydantic models from OpenAPI spec
• Route Handler: Updated /v2/customnode/import_fail_info_bulk to use Pydantic validation
• Error Handling: Added ValidationError handling with proper logging
• Exports: Updated data_models/__init__.py to export new ImportFailInfo models

Implementation Details

• Follows the process outlined in data_models/README.md
• Uses ImportFailInfoBulkRequest.model_validate() for input validation
• Returns ImportFailInfoBulkResponse for type-safe responses
• Consistent with other v2 endpoint patterns in the codebase

Test Plan

• Verify models generate correctly from OpenAPI spec
• Ensure ValidationError handling matches existing patterns
• Confirm response structure matches OpenAPI specification
• Validate import statements and exports work correctly

Implements the Pydantic validation as discussed in the code review process.

[christian-byrne]

LGTM