add docs/tests

[2025chris2]

PR 标题

docs: 添加 Prompt 调优测试报告（V1 基线 与 V3 对比）
功能描述
本次新增两份 Prompt 调优测试报告文档，用于记录 AI PR Review 系统中 Prompt 迭代的效果对比：

test1 — V1 基线报告：对 TheAlgorithms/Java#7427（QR 分解）PR 执行 10 轮 AI 评审，记录成功率、风险评级分布、跨文件问题检出、架构建议、响应时间及跨轮一致性。
test2 — V3 对比报告：对同一 PR 执行 5 轮 V3 版本 Prompt 的 AI 评审，并与 V1 进行量化对比，涵盖数值稳定性检出率、边界条件覆盖、摘要模板一致性、issueType 多样性等维度。
报告存放在 backend/pr/src/main/resources/docs/ 下，作为 Prompt 迭代调优的历史记录与决策依据，供团队回溯各版本 Prompt 的实际表现。

实现思路
采用格式化纯文本（Markdown 兼容）格式记录测试报告，每轮运行独立记录以下要素：AI 输出摘要、风险等级及理由、跨文件问题列表、架构建议、响应时间、错误信息。末尾附跨轮聚合统计（风险分布、一致性指标）以及版本间的量化对比数据。报告由 /review 流程自动生成并写入 resources 目录，无需额外依赖。

测试：
无需测试

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 6e46ed57-47c2-4cd5-b3c7-b9091b732d6f

📥 Commits

Reviewing files that changed from the base of the PR and between d4c13af and 79d2954.

📒 Files selected for processing (2)

• backend/pr/src/main/resources/docs/test1
• backend/pr/src/main/resources/docs/test2

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/tests

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