feat: v1.4.0 - 典型方案采纳、推荐方案列表、审计字段、导航优化

- 添加典型方案采纳功能 (POST /api/plans/<id>/adopt)
- 添加推荐方案列表 (GET /api/students/<id>/recommended-plans)
- PracticePlan 新增 created_by/updated_by/updated_at 审计字段
- 方案编辑/详情页导航优化 (bfcache 处理、pageshow 事件)
- 方案列表支持删除功能
- 学员列表'暂无方案/问题'样式统一
- 更新文档：问题文件已废弃（迁移到数据库）
- 更新部署脚本和验证清单

app/templates/index.html

@@ -389,12 +389,49 @@ const problemList = {{ problem_list | tojson }};
 const severityLevels = {{ severity_levels | tojson }};
 const practiceTimeOptions = {{ practice_time_options | tojson }};
 
+// 学员列表筛选状态管理
+const STUDENT_FILTER_KEY = 'index_student_filters';
+
+function saveStudentFilterState() {
+    const state = {
+        classId: document.getElementById('classFilter').value,
+        name: document.getElementById('nameFilter').value,
+        mineActive: document.getElementById('mineStudentFilterBtn').classList.contains('active')
+    };
+    sessionStorage.setItem(STUDENT_FILTER_KEY, JSON.stringify(state));
+}
+
+function restoreStudentFilterState() {
+    const saved = sessionStorage.getItem(STUDENT_FILTER_KEY);
+    if (!saved) return;
+    try {
+        const state = JSON.parse(saved);
+        if (state.classId) document.getElementById('classFilter').value = state.classId;
+        if (state.name) document.getElementById('nameFilter').value = state.name;
+        const btn = document.getElementById('mineStudentFilterBtn');
+        if (btn) {
+            if (state.mineActive) {
+                btn.classList.add('active', 'btn-primary');
+                btn.classList.remove('btn-outline-secondary');
+            } else {
+                btn.classList.remove('active', 'btn-primary');
+                btn.classList.add('btn-outline-secondary');
+            }
+        }
+        saveStudentFilterState();
+    } catch (e) {
+        console.error('恢复学员筛选状态失败', e);
+    }
+}
+
 // 页面初始化（base.html 统一登录检查后调用）
 window.pageInit = function(data) {
     loadAiTemplates();
     loadReportTemplates();
-    loadClassFilter();
-    loadStudents();
+    loadClassFilter().then(() => {
+        restoreStudentFilterState();
+        loadStudents();
+    });
     initProblemCheckboxes();
 
     // 检查 URL 参数，自动打开学员详情
@@ -481,6 +518,8 @@ function importStudents(input) {
 
 // 加载学员列表
 async function loadStudents() {
+    saveStudentFilterState();
+
     const classId = document.getElementById('classFilter').value;
     const name = document.getElementById('nameFilter').value;
     const mineFilter = document.getElementById('mineStudentFilterBtn').classList.contains('active');
@@ -552,10 +591,17 @@ function renderStudentList(students) {
             } else {
                 problemText = s.problem_names.join('、');
             }
-        } else {
+        } else if (s.problem_count > 0) {
             problemText = `${s.problem_count} 个问题`;
+        } else {
+            problemText = '<span class="text-muted">暂无问题</span>';
         }
 
+        // 构建方案数量显示（样式与问题一致）
+        const planCount = s.plan_count > 0;
+        const planBadgeText = planCount ? `${s.plan_count} 个方案` : '暂无方案';
+        const planBadgeClass = planCount ? 'bg-primary' : 'bg-light text-muted';
+
         html += `
             <div class="col-md-4 col-sm-6 mb-3">
                 <div class="card">
@@ -564,8 +610,8 @@ function renderStudentList(students) {
                             <h5 class="card-title">${s.name}</h5>
                             <p class="card-text text-muted small">${s.wechat_nickname || ''} ${s.phone ? '| ' + s.phone : ''}</p>
                             <span class="badge bg-info">${s.practice_time}</span>
-                            <span class="badge bg-secondary">${problemText}</span>
-                            <span class="badge bg-primary">${s.plan_count} 个方案</span>
+                            <span class="badge ${s.problem_count > 0 ? 'bg-secondary' : 'bg-light text-muted'}">${problemText}</span>
+                            <span class="badge ${planBadgeClass}">${planBadgeText}</span>
                             ${s.goal_count > 0 ? `<span class="badge bg-success">${s.goal_count}个目标(${s.completed_goal_count}已达成)</span>` : ''}
                         </div>
                     </a>