[FEATURE] Add versioned REST API endpoints for test results (v1)

[Rahul-2k4]

Summary

Implements a new versioned REST API module for Sample Platform test result data and adds endpoint tests.

Added endpoints

• GET /api/v1/tests/<id>/summary
• GET /api/v1/tests/<id>/results
• GET /api/v1/tests/<id>/files
• GET /api/v1/tests/<id>/progress
• GET /api/v1/categories

Implementation details

• Added new Flask blueprint module: mod_api/.
• Registered blueprint in run.py with url_prefix='/api'.
• Added 404 handling for missing test ids.
• Added API tests in tests/test_api/test_controllers.py.
• Included contract fix so /results uses result-backed expected_rc when available.
• Added not-found tests for /results, /files, and /progress.

Verification

Executed:

• /home/rahul/Desktop/GSoC_2026/ccextractor/sample-platform/.venv/bin/nose2 -v tests.test_api.test_controllers

Result:

• Ran 9 tests ... OK

Notes

• This PR is focused on API availability and baseline contract coverage for NG frontend consumption.
• Follow-up improvements can extend pagination/filtering/schema docs if maintainers prefer stricter contracts.

---

In raising this pull request, I confirm the following (please check boxes):

• I have read and understood the contributors guide.
• I have checked that another pull request for this purpose does not exist.
• I have considered, and confirmed that this submission will be valuable to others.
• I accept that this submission may not be used, and the pull request closed at the will of the maintainer.
• I give this submission freely, and claim no ownership to its content.

My familiarity with the project is as follows (check one):

• I have never used the project.
• I have used the project briefly.
• I have used the project extensively, but have not contributed previously.
• I am an active contributor to the project.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud