Document: Add JSON format support

[vprashrex]

Issue

Closes#986

Summary

• Previously Document doesn't support json format upload
• Added JSON format mapping to EXTENSION_TO_FORMAT and FORMAT_TO_EXTENSION, so to support .json upload in document.

Checklist

Before submitting a pull request, please ensure that you mark these task.

• Ran fastapi run --reload app/main.py or docker compose up in the repository root and test.
• If you've fixed a bug or added code that is tested and has test cases.

[coderabbitai]

📝 Walkthrough

Walkthrough

Two dictionary entries were added to the doctransform registry module, mapping the ".json" extension to the "json" format and vice versa, enabling the registry to recognize JSON files without raising an error.

Changes

JSON Format Registration

Layer / File(s)	Summary
Add JSON extension/format mappings backend/app/services/doctransform/registry.py	Adds .json ↔ "json" bidirectional entries to EXTENSION_TO_FORMAT and FORMAT_TO_EXTENSION, allowing .json files to be recognized without raising ValueError.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The registry now recognizes .json files, which should stop JSON upload failures as requested in #986.
Out of Scope Changes check	✅ Passed	The PR only adds JSON extension/format mappings and does not introduce unrelated changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title clearly matches the main change: adding JSON format support for document uploads.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/knoweldge-base-json

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[github-actions]

OpenAPI changes ⚪ No API surface changes

Note

This PR does not modify the API contract.

_{main ↔ 58df4427 · generated by oasdiff}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[github-actions]

🎉 This PR is included in version 1.2.2-main.1 🎉

The release is available on GitHub release

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