移动端拍照上传、奥数区、学段约束解题与 AI 模型配置。

- 手机/平板响应式布局，支持拍照与相册上传

- 学生详情新增奥数区，按初/高中学段生成解法并禁止超纲

- 系统设置可配置 Ollama 或 OpenAI 兼容 API

- 更新 frontend/dist 与使用说明

frontend/src/api/client.ts

@@ -1,6 +1,7 @@
 import axios from 'axios'
 import type {
   AdminUser,
+  AIProvider,
   Exam,
   PublicSettings,
   ScoreInput,
@@ -12,6 +13,7 @@ import type {
   TrendResponse,
   User,
   WrongQuestion,
+  WrongQuestionCategory,
 } from '../types'
 import type { ExamType } from '../types'
 
@@ -68,8 +70,15 @@ export const settingsApi = {
 
 export const adminApi = {
   getSettings: () => api.get<SystemSettings>('/admin/settings'),
-  updateSettings: (data: { registration_enabled?: boolean }) =>
-    api.patch<SystemSettings>('/admin/settings', data),
+  updateSettings: (data: {
+    registration_enabled?: boolean
+    ai_provider?: AIProvider
+    ollama_base_url?: string | null
+    ollama_model?: string | null
+    openai_base_url?: string | null
+    openai_model?: string | null
+    openai_api_key?: string
+  }) => api.patch<SystemSettings>('/admin/settings', data),
   updateProfile: (data: {
     username?: string
     current_password?: string
@@ -120,11 +129,12 @@ export const examApi = {
 }
 
 export const wrongQuestionApi = {
-  list: (studentId: string, params?: { subject_id?: number; q?: string }) =>
+  list: (studentId: string, params?: { subject_id?: number; q?: string; category?: WrongQuestionCategory }) =>
     api.get<WrongQuestion[]>(`/students/${studentId}/wrong-questions`, { params }),
-  upload: (studentId: string, subjectId: number, file: File) => {
+  upload: (studentId: string, subjectId: number, file: File, category: WrongQuestionCategory = 'regular') => {
     const form = new FormData()
     form.append('subject_id', String(subjectId))
+    form.append('category', category)
     form.append('file', file)
     return api.post<WrongQuestion>(`/students/${studentId}/wrong-questions`, form)
   },