Fix repo limit flag to cap total results

[abhinavgautam01]

Summary

Fixes the repo list and repo search --limit flag so it caps the total number of returned repositories instead of only changing the API page size.

Problem

The CLI currently maps --limit into PerPage for repository list/search options:

• repo list --limit N sets ListRepoOpts.PerPage = N
• repo search --limit N sets SearchRepoOpts.PerPage = N

This leaves Limit unset, so repository listing can keep fetching every page from the API instead of stopping at the requested number of results.

Expected behavior

--limit N should mean “return at most N repositories”.

Changes

• Map repo list --limit to ListRepoOpts.Limit.
• Map repo search --limit to SearchRepoOpts.Limit.
• Keep backend page size behavior separate from total result limiting.
• Add or update tests to verify the CLI passes Limit correctly.

Testing

go test ./internal/cli
go test ./...