Added GitHub Actions workflow for backend and frontend health check

[KumarAyush204]

Which issue does this PR close?

• Closes [ Feature ] GitHub Actions CI workflow for project validation #139

What changes are included in this PR?

This PR adds a GitHub Actions workflow that performs a health check for the SaralSeva project.

Workflow features:

Backend:

1. Installs all dependencies.
2. Starts the backend server and checks that it responds on the configured port (http://localhost:8000).

Frontend (User, Employee, Admin):

1. Installs dependencies for each frontend.
2. Starts the Vite dev server and verifies that the server responds on http://localhost:5173

Notes:

1. Non-fatal warnings are logged but do not fail the workflow.
2. MongoDB service is configured for backend connectivity checks.
3. Runs automatically on push and pull_request events for all branches, providing early feedback for contributors.

Are these changes tested?

Yes i have tested the workflow in forked Repository and results are :-

[vercel]

@KumarAyush204 is attempting to deploy a commit to the eccentriccoder01's projects Team on Vercel.

A member of the Team first needs to authorize it.

[KumarAyush204]

I have added backend dependencies (helmet and hpp) since those were not updated in package.json.

[eccentriccoder01]

Great work @KumarAyush204! Feel free to work on more issues or create new ones, and check out my other GSSoC25 projects too:

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  Thanks for improving SaralSeva 🧡