Add database health check endpoint

[yousef-v7]

While exploring the backend structure, I wanted to contribute a small but useful improvement.

I added a lightweight database health check endpoint at /api/health/db that performs a simple DB ping and returns status, latency, and timestamp.

I used AI mainly for brainstorming ideas, then implemented the feature myself to better understand the routing and backend structure.

How to test

1. Run the backend server
2. Send a GET request to: /api/health/db
3. Expected response:

{
"status": "ok",
"db": "up",
"latencyMs": number,
"timestamp": string
}

[Mohamed-Elshesheny]

Hey @yousef-v7 — thanks for taking the time to contribute, we appreciate it!

Before we proceed with the review, please address the following:

• Remove inline comments
• Revert tsconfig changes
• Follow contribution guidelines — see CONTRIBUTING.md for PR title format, code style, and commit conventions

Once updated, we'll be happy to review and get this merged. Let us know if anything is unclear.

[yousef-v7]

Updates applied:

• Removed inline comments
• Reverted tsconfig changes
• Updated commit to follow contribution guidelines

Happy to make any further adjustments if needed

[Mohamed-Elshesheny]

Thank You, @yousef-v7

Thank you for your contribution to WordyMe. The database health check endpoint is well-implemented.
We appreciate the quality of your work and welcome future contributions ❤️.