This introduces the ability to create multiple pull requests at once for
projects managing multiple packages.
Key changes:
- `pr create --separate-requests`: Automatically discovers packages using
`_manifest` (if present) or top-level directories. It iterates through
them and creates a PR for each if changes are detected.
- `pr create --dry-run`: Allows previewing the operations (source/target
details, title, description) without actually creating the pull request
on the server.
- Refactored `pr create` logic to separate argument parsing from the
creation action, enabling reuse for the batch operation.
- Improved handling of "detached HEAD" state in `gitea_api.Git`:
`current_branch` now returns `None` instead of an empty string, and
the command raises a helpful error message instead of failing on an
empty string check.
- Added early exit optimization for local packages that match the target
commit.
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