Security heads-up: leaked MongoDB database credentials in createAdmin.js

Hi there,

GitScan detected `MongoDB database credentials` possibly leaked in your public repository.

### Details

- **File**: [createAdmin.js](https://github.com/karantec/HospitalBackend/blob/4dfe7c98f2bc49c6a520d632a277f05dc742e1bc/createAdmin.js#L7)
- **Line**: 7
- **Commit**: [`4dfe7c9`](https://github.com/karantec/HospitalBackend/commit/4dfe7c98f2bc49c6a520d632a277f05dc742e1bc)
- **Snippet** (redacted):
```
"mongodb+srv://merndesi***********:****************@cluster0.c1gggji.mongodb.net/hospitalDB",cluster0.c1gggji.mongodb.net/hospitalDB",
```

### Recommended actions

1. **Revoke and rotate** database users/passwords (e.g. in [MongoDB Atlas](https://cloud.mongodb.com/) **Database Access**) and update connection strings.
2. Remove the secret from your code
3. Clean it from your Git history if possible
4. Push a new commit

When you're ready, **[mark this finding as resolved on GitScan](https://gitscan.ai/resolve?utm_source=issue&utm_medium=disclosure&utm_campaign=auto_issue&utm_content=mark_resolved&finding=gs_2b128af31ab715e9)** — we'll verify the fix automatically. You can also close this issue from GitHub if you prefer.