[Bug] th-cli calls /api/v1/version on every invocation (slow when backend is unreachable)

[abhisheksingh-esp]

Describe the bug

Describe the bug

th-cli hits GET /api/v1/version on every invocation, not just --version. When the backend is down, every command (--help, available-tests, etc.) hangs until the HTTP client times out.

Steps to reproduce

1. Stop the TH backend.
2. Run th-cli --help.
3. Observe a multi-second hang before help is printed.

Expected

Backend version lookup should run only when --version is requested.

Root cause

In cli/th_cli/main.py:

@click.version_option(message=get_extended_help())