Enable content type JSON export to be imported without modification

Parent Issue

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User Story

As a content architect, I want to be able to export a content type as JSON and import that same JSON file into another system without modification, so I can easily share content types among unconnected systems.

Acceptance Criteria

1. Copy the Blog content type from the starter site to an empty dotCMS site. This should work:
   a. Export the content type to JSON from an instance running the starter site.
   b. Import the JSON file (with no modification) to the instance running the empty starter.
2. Content type JSON files which could be successfully imported in earlier versions must still be able to be imported.

Proposed Objective

Technical User Experience

Proposed Priority

Priority 3 - Average

External Links... Slack Conversations, Support Tickets, Figma Designs, etc.

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Assumptions & Initiation Needs

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Quality Assurance Notes & Workarounds

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Sub-Tasks & Estimates

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Reproduce the Blog content type export/import workflow between a starter-site instance and an empty instance, using the unmodified JSON file. Trace the content type JSON export and import entry points, then verify that the current workflow succeeds and that JSON files from earlier versions remain importable.