krishna soni 17a55558b7 feat(cli): add --version flag to cli (#18534) ...

### Summary

This PR adds a `--version` (and `-V`) flag to the `ragflow-cli` tool.

### Usage

```bash
ragflow-cli --version

2026-08-20 10:33:03 +08:00

..

ragflow_server.go

feat[Go]: resuming transmission from the point of interruption during data source synchronisation (#18176)

2026-08-13 18:38:37 +08:00

ragflow-cli.go

feat(cli): add --version flag to cli (#18534)

2026-08-20 10:33:03 +08:00