fix: adjust get_latest_commit && get_blob API

[231220075]

Provide committer data to the get_latest_commit API;
Provide the refs parameter for the get blob API.

[Copilot]

Pull Request Overview

This PR adjusts two API endpoints related to Git operations: get_latest_commit and get_blob. The changes provide committer binding data directly in the commit response and add a refs parameter to the blob retrieval API for branch/tag-specific queries.

• Adds refs parameter to get_blob_as_string API for retrieving blobs from specific references
• Modifies get_latest_commit to populate author/committer data from commit bindings instead of returning separate binding info
• Adds author email and username fields to EditFilePayload to support commit-to-user binding

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 3 comments.

File	Description
mono/src/api/router/preview_router.rs	Passes refs parameter to blob retrieval; adds commit binding logic after file edits
mono/src/api/mod.rs	Updates blob retrieval call to include new refs parameter (None value)
ceres/src/model/git.rs	Adds refs field to BlobContentQuery; removes binding_info from LatestCommitInfo; adds author fields to EditFilePayload
ceres/src/api_service/mod.rs	Updates get_blob_as_string signature with refs parameter; modifies commit info population to inline binding data into author/committer fields

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[Copilot]

The query.path is cloned here but was previously consumed by into(). Since query.path is used only once, consider using query.path.into() without cloning to avoid unnecessary allocation.

Suggested change

	.get_blob_as_string(query.path.clone().into(), Some(query.refs.as_str()))
	.get_blob_as_string(query.path.into(), Some(query.refs.as_str()))

[Copilot]

The binding information unconditionally overwrites both author and committer data. This loses the original Git commit author/committer information. Consider preserving the original data or making this behavior explicit, as it may confuse users expecting to see actual Git metadata.

Suggested change

	// Fill both author and committer for UI consumption
	commit_info.author.display_name = display.clone();
	commit_info.author.avatar_url = avatar.clone();
	commit_info.committer.display_name = display;
	commit_info.committer.avatar_url = avatar;
	// Fill author fields with binding info, preserve original committer info
	commit_info.author.display_name = display.clone();
	commit_info.author.avatar_url = avatar.clone();
	// Do not overwrite committer fields to preserve original Git metadata
	// commit_info.committer.display_name = display;
	// commit_info.committer.avatar_url = avatar;

[Copilot]

The error message 'Failed to update commit binding' is misleading since upsert_binding performs both insert and update operations. Consider using 'Failed to save commit binding' for clarity.

Suggested change

	.map_err(|e| ApiError::from(anyhow::anyhow!("Failed to update commit binding: {}", e)))?;
	.map_err(|e| ApiError::from(anyhow::anyhow!("Failed to save commit binding: {}", e)))?;

[benjamin-747]

link #1555