fix: remove intentional exception in /ping endpoint to prevent 500 errors

[plural-copilot]

Summary:
The current /ping endpoint raises an intentional exception approximately one-third of the time, causing 500 Internal Server Errors and triggering alerts for high error rates. This PR removes the intentional exception to make /ping reliably respond with success.

Changes Made:

• Removed conditional exception raise in /ping endpoint in app/main.py.

Rationale:
This change ensures the /ping endpoint, typically used for Kubernetes health checks, always returns a successful response. This will prevent spurious 500 errors, keep the alert from firing, and improve service reliability.

After merging, the updated service should be redeployed to clear the alert.