feat(plan): 添加学生学案历史查询及展示功能

- 新增FindStudentPlanHistoryReqVO和FindStudentPlanHistoryListRspVO数据对象
- 将LessonPlansDO及StudentLessonPlansDO中日期类型由Date改为LocalDateTime
- LessonPlansServiceImpl中创建时间使用LocalDateTime.now()
- StudentLessonPlansService及实现类添加按学生ID查询学案历史接口
- StudentLessonPlansDOMapper及XML添加按学生ID查询学案历史SQL映射
- StudentLessonPlansController新增/history接口返回学生学案历史列表
- 前端student.vue新增学案历史图表PlanHistoryChart组件展示学案历史数据
- 新增PlanHistoryChart.vue组件，实现基于echarts的学案历史折线图
- studentLessonPlans.js新增findStudentPlanHistory接口调用后端学案历史数据接口

enlish-vue/src/pages/student.vue

@@ -27,6 +27,10 @@
                         <div class="text-md font-semibold mb-3">学生考试记录</div>
                         <ExamHistoryChart :data="history" />
                     </div>
+                    <div class="bg-white dark:bg-gray-800 rounded-lg shadow p-6">
+                        <div class="text-md font-semibold mb-3">学生学案记录</div>
+                        <PlanHistoryChart :student-id="route.params.id" />
+                    </div>
                 </div>
             </el-main>
 
@@ -41,6 +45,7 @@ import { useRoute } from 'vue-router'
 import { getStudentDetail } from '@/api/student'
 import { getStudentExamHistory } from '@/api/exam'
 import ExamHistoryChart from '@/layouts/components/student/ExamHistoryChart.vue'
+import PlanHistoryChart from '@/layouts/components/student/PlanHistoryChart.vue'
 
 const loading = ref(false)
 const detail = ref(null)