[mono]UPDATE: Alter to CommonPage and Restored content_diff for debug…

[AidCheng]

Update #1298

API and Model

• Restored the old files_changed API for debugging
• Changed page_id/page_size path parameters to pagination request body
• Now uses a new DiffItem model to store all the file diff data

Services Change

• mono service content_diff and paged_content_diff now return a list of DiffItem instead of String
• removed extract_files_service due to improved content_diff function

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Project	Deployment	Preview	Comments	Updated (UTC)
mega	✅ Ready	Preview	Comment	Aug 14, 2025 8:19am

[Copilot]

Pull Request Overview

This PR refactors the diff functionality to use a new DiffItem model instead of returning raw string data. The main purpose is to improve API design by providing structured diff data and implementing pagination properly for merge request file changes.

Key changes:

• Introduced DiffItem model to structure diff output with file paths and data
• Changed API endpoints to use request body pagination instead of path parameters
• Restored the old files_changed API for debugging purposes

Reviewed Changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
neptune/src/model/diff_model.rs	Introduces new DiffItem struct with path and data fields
neptune/src/neptune_engine.rs	Updates diff function to return Vec<DiffItem> instead of concatenated string
mono/src/api/mr/mr_router.rs	Adds new paginated endpoint and keeps old endpoint for debugging
ceres/src/api_service/mono_api_service.rs	Refactors diff services to return structured data and implement proper pagination
mono/src/api/mr/mod.rs	Updates response models to use DiffItem and adds FilesChangedPage

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[benjamin-747]

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