feat(年度趋势): 历年概况那张表只有一堆数、看不出趋势;改成按届比,这届和往届在同一批题上逐题比一次就对

- 新接口 /problem-analytics/grades:每道题在各届(班号前两位)的人数和一次就对人数
- 删掉 /problem-analytics/yearly 和只给它用的学年时间函数

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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xuyueandClaude Opus 5.5 committed 2026-10-12 13:10:18 +08:00
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