Import a complete marketplace configuration from a JSON file previously exported.
This endpoint accepts the exported JSON file as a multipart/form-data upload.

Import Process:

• Uploads and validates the JSON file structure
• Generates new IDs for all entities to avoid conflicts
• Maps connection relationships in requests and sessions
• Assigns to the specified tenant and cobrand
• Creates audit trail entries for all imported items
• Handles cross-environment imports with brand code mapping

Important Notes:

• This creates new marketplace entities; it does not update existing ones
• Connection names are used to maintain relationships during import
• Sensitive data like client secrets are regenerated for security
• Import supports cross-environment scenarios with brand code mapping
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