[mono]FEAT: Custom root for MUI tree request

[AidCheng]

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Project	Deployment	Preview	Comments	Updated (UTC)
mega	Ready	Preview	Comment	Sep 15, 2025 0:19am

[Copilot]

Pull Request Overview

This PR adds support for filtering MUI tree results by a custom root path, allowing clients to request tree data for specific directory subtrees rather than the entire repository structure.

• Adds TreeQuery parameter to the MUI tree endpoint to accept optional path filtering
• Updates the get_sorted_changed_file_list method to support path-based filtering of files
• Fixes a bug in the GPG signature checker where failures were incorrectly marked as passed

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
mono/src/api/mr/mr_router.rs	Updates MUI tree endpoint to accept TreeQuery parameter and pass path filter to file listing
mono/src/api/mr/model.rs	Adds empty line formatting change
ceres/src/merge_checker/gpg_signature_checker.rs	Fixes bug where GPG verification failures were marked as passed
ceres/src/api_service/mono_api_service.rs	Implements path filtering in get_sorted_changed_file_list method and adds tests

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