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/plans.html

@@ -75,18 +75,86 @@
 <script>
 // 防抖定时器
 let debounceTimer = null;
+const STORAGE_KEY = 'plans_filters';
 
 function debounceLoad() {
     clearTimeout(debounceTimer);
     debounceTimer = setTimeout(loadPlans, 300);
 }
 
+// 保存筛选状态到 sessionStorage
+function saveFilterState() {
+    const state = {
+        classId: document.getElementById('filterClass').value,
+        templateId: document.getElementById('filterTemplate').value,
+        isTypical: document.getElementById('filterTypical').value,
+        studentName: document.getElementById('filterStudentName').value,
+        problemId: document.getElementById('filterProblem').value,
+        mineActive: document.getElementById('minePlansBtn')?.classList.contains('active')
+    };
+    sessionStorage.setItem(STORAGE_KEY, JSON.stringify(state));
+}
+
+// 恢复筛选状态
+function restoreFilterState() {
+    const saved = sessionStorage.getItem(STORAGE_KEY);
+    if (!saved) return;
+    try {
+        const state = JSON.parse(saved);
+        if (state.classId) document.getElementById('filterClass').value = state.classId;
+        if (state.templateId) document.getElementById('filterTemplate').value = state.templateId;
+        if (state.isTypical) document.getElementById('filterTypical').value = state.isTypical;
+        if (state.studentName) document.getElementById('filterStudentName').value = state.studentName;
+        if (state.problemId) document.getElementById('filterProblem').value = state.problemId;
+
+        const btn = document.getElementById('minePlansBtn');
+        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');
+            }
+        }
+
+        // 确保状态同步保存
+        saveFilterState();
+    } catch (e) {
+        console.error('恢复筛选状态失败', e);
+    }
+}
+
 // 页面初始化
 window.pageInit = function() {
-    loadFilters();
-    loadPlans();
+    checkAndRefresh();
 };
 
+// 检查是否需要刷新（从详情页返回）
+function checkAndRefresh() {
+    const needsRefresh = sessionStorage.getItem('plans_needs_refresh') === 'true';
+    if (needsRefresh) {
+        sessionStorage.removeItem('plans_needs_refresh');
+        loadFilters().then(() => {
+            restoreFilterState();
+            loadPlans(true);
+        });
+    } else {
+        loadFilters().then(() => {
+            restoreFilterState();
+            loadPlans(false);
+        });
+    }
+}
+
+// pageshow 事件处理 bfcache 恢复的情况
+window.addEventListener('pageshow', function(event) {
+    if (event.persisted) {
+        // 页面从 bfcache 恢复，需要重新检查刷新标记
+        checkAndRefresh();
+    }
+});
+
 // 加载筛选器选项
 async function loadFilters() {
     // 加载班级
@@ -107,7 +175,7 @@ async function loadFilters() {
         const problems = await resp.json();
         const problemSelect = document.getElementById('filterProblem');
         problems.forEach(p => {
-            problemSelect.innerHTML += `<option value="${p.id}">${p.name}</option>`;
+            problemSelect.innerHTML += `<option value="${p.id}">${p.no} - ${p.name}</option>`;
         });
     } catch (e) {
         console.error('加载问题失败', e);
@@ -128,6 +196,9 @@ async function loadFilters() {
 
 // 加载方案列表
 async function loadPlans() {
+    // 保存当前筛选状态
+    saveFilterState();
+
     const container = document.getElementById('plansContainer');
     container.innerHTML = '<div class="text-center text-muted py-5"><i class="bi bi-hourglass fs-4"></i><p class="mt-2">加载中...</p></div>';
 
@@ -199,6 +270,7 @@ async function loadPlans() {
                     <td class="text-muted small">${p.created_at || ''}</td>
                     <td>
                         <button class="btn btn-sm btn-outline-primary" onclick="viewPlan(${p.id})">查看</button>
+                        <button class="btn btn-sm btn-outline-danger" onclick="deletePlan(${p.id})">删除</button>
                     </td>
                 </tr>
             `;
@@ -224,6 +296,7 @@ function clearFilters() {
         mineBtn.classList.remove('active', 'btn-primary');
         mineBtn.classList.add('btn-outline-secondary');
     }
+    sessionStorage.removeItem(STORAGE_KEY);
     loadPlans();
 }
 
@@ -239,6 +312,7 @@ function toggleMinePlans() {
         btn.classList.remove('btn-primary');
         btn.classList.add('btn-outline-secondary');
     }
+    saveFilterState();
     loadPlans();
 }
 
@@ -246,5 +320,21 @@ function toggleMinePlans() {
 function viewPlan(planId) {
     window.location.href = `/plan/${planId}`;
 }
+
+// 删除方案
+async function deletePlan(planId) {
+    if (!confirm('确定删除该方案？删除后无法恢复。')) return;
+    try {
+        const resp = await fetch(`/api/plans/${planId}`, { method: 'DELETE' });
+        if (resp.ok) {
+            loadPlans();  // 刷新列表
+        } else {
+            const err = await resp.json();
+            alert('删除失败: ' + (err.error || '未知错误'));
+        }
+    } catch (e) {
+        alert('删除失败: ' + e.message);
+    }
+}
 </script>
 {% endblock %}