[BUG] CI test failures in docs.test.js and uploadPhoto.test.js

[Dev-Mayuresh]

Bug Description

The CI test suite in GitHub Actions has been failing during automated test runs due to missing endpoint documentation in docs/api.md and outdated test expectations in backend/tests/uploadPhoto.test.js.

Steps to Reproduce

1. Run npx vitest run in the project root.
2. Observe test failures in backend/tests/docs.test.js and backend/tests/uploadPhoto.test.js.

Root Cause

1. backend/tests/docs.test.js asserts that all production API endpoints and upload validation rules are documented in docs/api.md. The /api/upload and /api/users/upload-photo endpoints, along with magic-byte validation specs, were missing from docs/api.md.
2. backend/tests/uploadPhoto.test.js contained obsolete test assertions expecting a 5MB upload size limit (reduced to 2MB in PR Severe Security: Remote Code Execution via Unrestricted File Upload in Profile Assets #1850) and an outdated fileUrl regex format.

Impact

GitHub Actions CI test runs fail on pull requests and main branch commits, blocking valid PR integrations and deployment pipelines.

Proposed Fix

1. Update docs/api.md to document /api/upload, /api/users/upload-photo, and their associated magic byte and preset validation rules.
2. Update backend/tests/uploadPhoto.test.js assertions to reflect the 2MB photo size limit and correct user-scoped fileUrl pathing.

[Dev-Mayuresh]

Hey @durdana3105! I've identified the root cause of these CI test failures in docs.test.js and uploadPhoto.test.js and have a fix ready. Could you please assign this issue to me under GSSoC '26?

/assign