完善移动端个人中心与评分流程，补全雅思学习时长统计 - #90
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yydounai1234 merged 4 commits intoAug 14, 2026
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本次改动中的后端帮助中心、IELTS 周统计、录音释放与专项评分链路整体契约一致；后端定向测试、移动端相关测试及 TypeScript 检查均通过。头像选择流程仍存在一个会阻断部分合法图片上传的兼容性问题，已在对应代码处标注。
Additional findings
frontend/mobile/src/screens/ProfileScreen.tsx:196: [P2] 允许 MIME 类型缺失的合法头像: 这里把缺失的asset.mimeType转为空字符串并直接拒绝，但当前使用的expo-image-picker57.0.9 将ImagePickerAsset.mimeType定义为可选，并明确表示无法判断时可能为空。因此图库返回合法 JPEG/PNG、但没有 MIME 元数据时，用户会稳定收到“请选择 JPEG 或 PNG 图片”且无法上传头像。请在 MIME 缺失时根据fileName/URI 扩展名推断，或允许提交后由服务端校验文件内容。
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Closes #89
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