feat(复习): 支持会话维度复习 + 标准导图按会话过滤

- MindMapNode 新增 sessionNum 字段，追踪节点来源会话
- BuiltinMindMapGenerator 生成节点时填充 sessionNum
- MindMapTreeTool.filterBySession() 按会话过滤标准导图
- recallCompare 接受 sessionNum 参数，筛选后对比
- 新增 review_recall_records.session_num 字段（Flyway V20260705_1）
- 新增 GET /study-sessions/tasks/{taskNum}/sessions 端点
- 前端 ReviewRecall.vue 增加复习范围选择器（全部/指定会话）
- 历史报告条目展示学习预期目标

src/components/ReviewRecall.vue

@@ -12,6 +12,7 @@ import {
 } from "@/api/standardMindMap";
 import { ElMessage, ElMessageBox } from "element-plus";
 import MindMapViewer, { type MindMapTreeNode } from "@/components/MindMapViewer.vue";
+import { getTaskSessions } from "@/api/studySessions";
 
 const route = useRoute();
 const router = useRouter();
@@ -25,6 +26,11 @@ let comparingTimer: ReturnType<typeof setInterval> | null = null;
 const lastResult = ref<any>(null);
 const hasCompared = ref(false);
 
+// 复习维度选择
+const sessions = ref<{ sessionNum: string; startTime: string; expectation: string; reportCount: number; fragmentCount: number }[]>([]);
+const selectedSession = ref("");
+const loadingSessions = ref(false);
+
 // 回忆输入（思维导图形式）
 const recallTree = ref<MindMapTreeNode | null>(null);
 const recallViewer = ref<InstanceType<typeof MindMapViewer> | null>(null);
@@ -144,7 +150,7 @@ const handleRecallCompare = async () => {
   comparingSeconds.value = 0;
   comparingTimer = setInterval(() => { comparingSeconds.value++; }, 1000);
   try {
-    const res = await recallCompare(taskNum.value, outline);
+    const res = await recallCompare(taskNum.value, outline, selectedSession.value || undefined);
     standard.value = res?.data || null;
     hasCompared.value = true;
     // 解析对比结果
@@ -270,8 +276,29 @@ const extraNodes = computed(() => {
   return raw.map((item: any) => typeof item === "string" ? { title: item } : item);
 });
 
+// 加载会话列表（复习维度选择器用）
+const loadSessions = async () => {
+  loadingSessions.value = true;
+  try {
+    const res = await getTaskSessions(taskNum.value);
+    sessions.value = res?.data || [];
+  } catch {
+    sessions.value = [];
+  } finally {
+    loadingSessions.value = false;
+  }
+};
+
+// 格式化会话标签
+const formatSessionLabel = (s: { sessionNum: string; startTime: string; expectation: string; reportCount: number; fragmentCount: number }) => {
+  const date = s.startTime ? s.startTime.replace("T", " ").substring(0, 16) : s.sessionNum;
+  const hint = s.expectation ? s.expectation.substring(0, 30) : "";
+  return `${date} ${hint ? "— " + hint : ""}`;
+};
+
 onMounted(() => {
   loadData();
+  loadSessions();
 });
 </script>
 
@@ -286,6 +313,24 @@ onMounted(() => {
       </el-button>
     </div>
 
+    <!-- 复习维度选择器 -->
+    <div class="review-scope surface-card" v-if="sessions.length > 0 || loadingSessions">
+      <span class="scope-label">复习范围</span>
+      <el-select v-model="selectedSession" placeholder="选择复习范围" clearable size="small" :loading="loadingSessions">
+        <el-option label="全部任务" value="" />
+        <el-option
+          v-for="s in sessions"
+          :key="s.sessionNum"
+          :label="formatSessionLabel(s)"
+          :value="s.sessionNum"
+        />
+      </el-select>
+      <el-tag v-if="selectedSession" size="small" type="success" effect="light">
+        已过滤：仅匹配该会话知识点
+      </el-tag>
+      <span v-else-if="!selectedSession" class="scope-hint">不过滤，对比全部标准导图</span>
+    </div>
+
     <!-- 统计卡片 -->
     <div class="stats-card surface-card" v-if="hasCompared && lastResult">
       <div class="stat-item">
@@ -317,6 +362,8 @@ onMounted(() => {
           @click="selectHistoryRecord(record)"
         >
           <span class="history-time">{{ record.createdTime?.replace("T", " ")?.substring(0, 16) }}</span>
+          <el-tag v-if="record.sessionNum" size="small" type="success" effect="plain" class="session-badge">会话</el-tag>
+          <el-tag v-else size="small" type="info" effect="plain" class="session-badge">全部</el-tag>
           <span class="history-ratio">覆盖率 {{ (record.recallRatio * 100).toFixed(1) }}%</span>
           <span class="history-detail">✅{{ record.matchedCount }} ❌{{ record.missedCount }} ➕{{ record.extraCount }}</span>
         </div>
@@ -709,4 +756,29 @@ onMounted(() => {
 .history-detail {
   color: var(--text-secondary, #666);
 }
+
+/* 复习范围选择器 */
+.review-scope {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  flex-wrap: wrap;
+  padding: 12px 22px;
+}
+
+.scope-label {
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--green-800);
+  white-space: nowrap;
+}
+
+.scope-hint {
+  font-size: 12px;
+  color: var(--text-secondary, #999);
+}
+
+.session-badge {
+  flex-shrink: 0;
+}
 </style>