Add OpenAPI Schema Generation Test to CI Workflow

[hardikkaurani]

🟡 Intermediate Issue

Problem

There is no automated test verifying that the FastAPI OpenAPI schema generates correctly. Schema generation errors can silently break API docs.

Why It Matters

A simple test calling app.openapi() catches schema generation bugs before they reach production API documentation consumers.

Suggested Files

• backend/tests/test_openapi_schema.py (new file)

Definition of Done

• Test calling app.openapi() added.
• Test verifies valid OpenAPI 3.1 output structure.
• pytest passes cleanly.

[hardikkaurani]

👋 Maintainer Solution Guide:

1. Create backend/tests/test_openapi_schema.py
2. Import the FastAPI app and call app.openapi()
3. Assert the output contains openapi, info, paths keys
4. Assert no exception is raised during schema generation
5. Run pytest to verify

Simple but important quality gate! ✅