[MNT] Remove deprecated orjson dependency

[alyssadai]

• Closes Remove orjson dependency #267
• Closes Regenerate uv.lock file with pytest-cov #242

Checklist

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For bug fixes:

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Summary by Sourcery

Remove the deprecated orjson dependency from the application and project configuration.

Enhancements:

• Remove the deprecated orjson dependency and use FastAPI's standard response handling.

Build:

• Update project dependency configuration and lockfile to eliminate orjson.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Removes the deprecated orjson dependency by eliminating FastAPI's global ORJSON response configuration, updating project dependencies, and regenerating the UV lockfile.

File-Level Changes

Change	Details	Files
Remove the application-wide ORJSON response configuration so FastAPI no longer requires the deprecated serialization dependency.	Remove the ORJSONResponse import. Remove ORJSONResponse as the FastAPI default response class.	app/main.py
Remove the deprecated dependency and normalize dependency-list formatting.	Delete orjson from runtime dependencies. Reformat runtime and development dependency entries with consistent indentation.	pyproject.toml
Regenerate the lockfile after removing the dependency.	Update resolved dependency metadata and package entries to reflect the removal of orjson.	uv.lock

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#242	Regenerate uv.lock so the development dependencies reflect the switch from coverage to pytest-cov.	✅
#267	Replace the application-wide use of FastAPI's deprecated ORJSONResponse with the default JSONResponse behavior.	✅
#267	Remove the orjson package from the project's runtime dependencies and lockfile.	✅

Possibly linked issues

• Remove orjson dependency #267: The PR removes ORJSONResponse and orjson from dependencies, directly implementing the issue request.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.48%. Comparing base (342e419) to head (cd00681).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #268   +/-   ##
=======================================
  Coverage   97.48%   97.48%           
=======================================
  Files          26       26           
  Lines         996      996           
  Branches       59       59           
=======================================
  Hits          971      971           
  Misses         18       18           
  Partials        7        7           

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[surchs]

Thanks @alyssadai

🧑‍🍳