2025 Backlog: 实现排行榜与结果明细 API

[however-yir]

Summary

实现排行榜与结果明细 API

Scope

• Align this task with the 2025 project roadmap.
• Keep compatibility with existing capabilities and interfaces.
• Deliver in small, reviewable changes.

Acceptance Criteria

• Scope is implemented and verified.
• Related docs/comments are updated.
• No regression in existing behavior.

Planned Window

2025-06