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/layouts/components/student/PlanHistoryChart.vue

@@ -0,0 +1,131 @@
+<template>
+    <div style="width: 100%; height: 260px;">
+        <div ref="elRef" style="width: 100%; height: 100%;"></div>
+    </div>
+</template>
+
+<script setup>
+import { defineProps, ref, onMounted, onUnmounted, watch } from 'vue'
+import { findStudentPlanHistory } from '@/api/studentLessonPlans'
+
+const props = defineProps({
+    studentId: { type: [Number, String], required: true }
+})
+
+const elRef = ref(null)
+let chart = null
+let echartsLib = null
+const rows = ref([])
+
+function sortData(arr) {
+    return Array.isArray(arr)
+        ? arr.slice().sort((a, b) => new Date(a.startTime).getTime() - new Date(b.startTime).getTime())
+        : []
+}
+
+function toSource(arr) {
+    return sortData(arr).map(it => ({
+        startTime: it.startTime,
+        totalCount: Number(it.totalCount) || 0,
+        planId: it.planId ?? null,
+        id: it.id ?? null
+    }))
+}
+
+function buildOption(source) {
+    return {
+        dataset: [
+            {
+                id: 'dataset_history',
+                source: source
+            }
+        ],
+        tooltip: {
+            trigger: 'axis'
+        },
+        xAxis: {
+            type: 'category',
+            nameLocation: 'middle'
+        },
+        yAxis: {
+            name: 'Total Count',
+            min: 0
+        },
+        series: [
+            {
+                type: 'line',
+                datasetId: 'dataset_history',
+                showSymbol: false,
+                encode: {
+                    x: 'startTime',
+                    y: 'totalCount',
+                    itemName: 'startTime',
+                    tooltip: ['totalCount']
+                }
+            }
+        ]
+    }
+}
+
+function resize() {
+    if (chart) chart.resize()
+}
+
+async function ensureEcharts() {
+    try {
+        const mod = await import('echarts')
+        echartsLib = mod
+    } catch (e) {
+        if (window.echarts) {
+            echartsLib = window.echarts
+        } else {
+            await new Promise(resolve => {
+                const s = document.createElement('script')
+                s.src = 'https://cdn.jsdelivr.net/npm/echarts@5/dist/echarts.min.js'
+                s.onload = resolve
+                document.head.appendChild(s)
+            })
+            echartsLib = window.echarts
+        }
+    }
+}
+
+async function render() {
+    if (!elRef.value) return
+    await ensureEcharts()
+    if (!echartsLib) return
+    if (!chart) {
+        chart = echartsLib.init(elRef.value)
+        window.addEventListener('resize', resize)
+    }
+    const source = toSource(rows.value)
+    const option = buildOption(source)
+    chart.setOption(option)
+}
+
+async function fetch() {
+    if (props.studentId === undefined || props.studentId === null) return
+    const res = await findStudentPlanHistory(Number(props.studentId))
+    const d = res?.data?.data ?? []
+    rows.value = Array.isArray(d) ? d : []
+}
+
+onMounted(async () => {
+    await fetch()
+    await render()
+})
+
+onUnmounted(() => {
+    window.removeEventListener('resize', resize)
+    if (chart) {
+        chart.dispose()
+        chart = null
+    }
+})
+
+watch(() => props.studentId, async () => {
+    await fetch()
+    await render()
+})
+</script>
+