Expose additional parameters that the Gitea SDK supports but were not
yet wired through the MCP tool definitions:
- list_issues: labels, since, before filters
- issue_write: labels and deadline on create, deadline/remove_deadline on update
- pull_request_write: labels/deadline on create/update, remove_deadline on update,
force_merge/merge_when_checks_succeed/head_commit_id on merge
- list_branches: page/perPage pagination
- create_repo: trust_model, object_format_name
- label_write: is_archived on create/edit
Also adds params.GetOptionalTime helper for RFC3339 timestamp parsing
and tests for the most important new parameters.
Co-Authored-By: Claude (claude-opus-4-6) <noreply@anthropic.com>
