feat: 收藏转待办功能 v2.0.0

- 新增 /api/items/<id>/convert API
- 支持两种转换方式：
  - 直接转换（convert）：原收藏变为待办
  - 复制创建（copy）：保留原收藏，新建待办
- 文本/链接/专栏类型可转换
- 内容自动合并到待办备注
- 前端列表和详情页添加转换按钮
- 弹窗配置：标题、状态、优先级、截止日期

xian_favor/api.py

@@ -134,6 +134,71 @@ def reopen_item(item_id):
     return jsonify({'success': True, 'data': item})
 
 
+@app.route('/api/items/<int:item_id>/convert', methods=['POST'])
+def convert_item(item_id):
+    """将收藏转换为待办"""
+    item = db.get_item(item_id)
+    if not item:
+        return jsonify({'success': False, 'error': '条目不存在'}), 404
+    
+    # 不能转换已经是待办的
+    if item['type'] == 'todo':
+        return jsonify({'success': False, 'error': '已经是待办事项'}), 400
+    
+    data = request.get_json() or {}
+    mode = data.get('mode', 'convert')  # convert 或 copy
+    
+    if mode not in ['convert', 'copy']:
+        return jsonify({'success': False, 'error': '无效转换模式'}), 400
+    
+    # 构建待办数据
+    todo_data = {
+        'type': 'todo',
+        'title': data.get('title') or item['title'] or f'{item["type"]}收藏',
+        'status': data.get('status', 'pending'),
+        'priority': data.get('priority', 'medium'),
+        'due_date': data.get('due_date'),
+        'tags': item['tags'],  # 继承原标签
+    }
+    
+    # 根据原类型处理内容
+    if item['type'] == 'text':
+        # 文本：content 放到 note
+        todo_data['note'] = item['content'] or ''
+        if item['note']:
+            todo_data['note'] += '\n\n' + item['note']
+    elif item['type'] == 'link':
+        # 链接：url 放到 note，保留链接可点击
+        todo_data['note'] = f'链接: {item["url"]}\n\n'
+        if item['content']:
+            todo_data['note'] += item['content'] + '\n\n'
+        if item['note']:
+            todo_data['note'] += item['note']
+        # url 字段也保留（方便后续操作）
+        todo_data['content'] = item['url']
+    elif item['type'] == 'column':
+        # 专栏：url + source 放到 note
+        todo_data['note'] = f'专栏: {item["url"]}\n'
+        if item['source']:
+            todo_data['note'] += f'来源: {item["source"]}\n\n'
+        if item['content']:
+            todo_data['note'] += item['content'] + '\n\n'
+        if item['note']:
+            todo_data['note'] += item['note']
+        todo_data['content'] = item['url']
+    
+    if mode == 'convert':
+        # 直接转换：更新原条目
+        db.update_item(item_id, **todo_data)
+        result = db.get_item(item_id)
+        return jsonify({'success': True, 'data': result, 'mode': 'convert'})
+    else:
+        # 复制创建：新建待办，原条目保留
+        new_id = db.create_item(**todo_data)
+        result = db.get_item(new_id)
+        return jsonify({'success': True, 'data': result, 'mode': 'copy', 'original_id': item_id})
+
+
 @app.route('/api/tags', methods=['GET'])
 def list_tags():
     """列出标签"""
@@ -691,6 +756,9 @@ INDEX_TEMPLATE = '''
                 </div>
             </div>
             <div class="modal-footer">
+                <button type="button" class="btn btn-outline-secondary" id="detailConvertBtn" onclick="showConvertModalFromDetail()" style="display:none;">
+                    <i class="bi bi-arrow-repeat"></i> 转为待办
+                </button>
                 <button type="button" class="btn btn-outline-primary" onclick="openEditModalFromDetail()">
                     <i class="bi bi-pencil"></i> 编辑
                 </button>
@@ -940,6 +1008,80 @@ INDEX_TEMPLATE = '''
     </div>
 </div>
 
+<!-- 转换为待办模态框 -->
+<div class="modal fade" id="convertModal" tabindex="-1">
+    <div class="modal-dialog modal-lg">
+        <div class="modal-content">
+            <div class="modal-header">
+                <h5 class="modal-title"><i class="bi bi-arrow-repeat"></i> 转为待办</h5>
+                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
+            </div>
+            <div class="modal-body">
+                <input type="hidden" id="convertItemId">
+                
+                <div class="mb-3">
+                    <label class="form-label fw-bold">转换方式</label>
+                    <div class="form-check">
+                        <input class="form-check-input" type="radio" name="convertMode" id="modeConvert" value="convert" checked>
+                        <label class="form-check-label" for="modeConvert">
+                            <strong>直接转换</strong> - 原收藏变为待办，数据合并
+                        </label>
+                    </div>
+                    <div class="form-check">
+                        <input class="form-check-input" type="radio" name="convertMode" id="modeCopy" value="copy">
+                        <label class="form-check-label" for="modeCopy">
+                            <strong>复制创建</strong> - 保留原收藏，新建待办任务
+                        </label>
+                    </div>
+                </div>
+                
+                <hr>
+                
+                <div class="mb-3">
+                    <label class="form-label">待办标题</label>
+                    <input type="text" id="convertTitle" class="form-control">
+                </div>
+                
+                <div class="row mb-3">
+                    <div class="col">
+                        <label class="form-label">状态</label>
+                        <select id="convertStatus" class="form-select">
+                            <option value="pending">⏳ 待处理</option>
+                            <option value="in_progress">🔄 进行中</option>
+                        </select>
+                    </div>
+                    <div class="col">
+                        <label class="form-label">优先级</label>
+                        <select id="convertPriority" class="form-select">
+                            <option value="low">🟢 低</option>
+                            <option value="medium" selected>🟡 中</option>
+                            <option value="high">🟠 高</option>
+                            <option value="urgent">🔴 紧急</option>
+                        </select>
+                    </div>
+                    <div class="col">
+                        <label class="form-label">截止日期</label>
+                        <input type="date" id="convertDueDate" class="form-control">
+                    </div>
+                </div>
+                
+                <div class="mb-3">
+                    <label class="form-label text-muted">内容预览（转换后会合并到待办备注）</label>
+                    <div id="convertPreview" class="border rounded p-2 bg-light" style="max-height: 150px; overflow-y: auto;">
+                        <!-- 动态填充 -->
+                    </div>
+                </div>
+            </div>
+            <div class="modal-footer">
+                <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">取消</button>
+                <button type="button" class="btn btn-primary" onclick="executeConvert()">
+                    <i class="bi bi-check"></i> 确认转换
+                </button>
+            </div>
+        </div>
+    </div>
+</div>
+
 <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>
 <script>
 const API_BASE = '/api';
@@ -1050,6 +1192,7 @@ function renderItems(items) {
                     </div>
                     <div class="d-flex align-items-center gap-1 flex-wrap ms-2" onclick="event.stopPropagation();">
                         ${item.tags.slice(0, 2).map(t => `<span class="badge bg-secondary" style="font-size:10px;">${t}</span>`).join('')}
+                        ${item.type !== 'todo' ? `<button class="btn btn-sm btn-outline-secondary py-0 px-1" onclick="showConvertModal(${item.id})" title="转为待办"><i class="bi bi-arrow-repeat" style="font-size:11px;"></i></button>` : ''}
                         <button class="btn btn-sm btn-outline-info py-0 px-1" onclick="showSendEmailModal(${item.id})" title="发送邮件"><i class="bi bi-envelope" style="font-size:11px;"></i></button>
                         <button class="btn btn-sm btn-outline-primary py-0 px-1" onclick="openEditModal(${item.id})" title="编辑"><i class="bi bi-pencil" style="font-size:11px;"></i></button>
                         ${item.type === 'todo' && item.status !== 'completed' ? `<button class="btn btn-sm btn-outline-success py-0 px-1" onclick="completeItem(${item.id})" title="完成"><i class="bi bi-check-lg" style="font-size:11px;"></i></button>` : ''}
@@ -1176,6 +1319,80 @@ async function reopenItem(id) {
     }
 }
 
+// ============ 转换为待办 ============
+
+let convertItemData = null;
+
+async function showConvertModal(itemId) {
+    const res = await fetch(`${API_BASE}/items/${itemId}`);
+    const data = await res.json();
+    
+    if (!data.success) return;
+    
+    convertItemData = data.data;
+    document.getElementById('convertItemId').value = itemId;
+    
+    // 设置默认标题
+    document.getElementById('convertTitle').value = convertItemData.title || '';
+    
+    // 重置选项
+    document.getElementById('modeConvert').checked = true;
+    document.getElementById('convertStatus').value = 'pending';
+    document.getElementById('convertPriority').value = 'medium';
+    document.getElementById('convertDueDate').value = '';
+    
+    // 显示内容预览
+    let preview = '';
+    if (convertItemData.type === 'text') {
+        preview = convertItemData.content || '';
+    } else if (convertItemData.type === 'link') {
+        preview = `链接: ${convertItemData.url}`;
+        if (convertItemData.content) preview += `\n${convertItemData.content}`;
+    } else if (convertItemData.type === 'column') {
+        preview = `专栏: ${convertItemData.url}`;
+        if (convertItemData.source) preview += `\n来源: ${convertItemData.source}`;
+    }
+    if (convertItemData.note) preview += `\n\n备注: ${convertItemData.note}`;
+    
+    document.getElementById('convertPreview').textContent = preview || '(无内容)';
+    
+    new bootstrap.Modal(document.getElementById('convertModal')).show();
+}
+
+async function executeConvert() {
+    const itemId = document.getElementById('convertItemId').value;
+    const mode = document.querySelector('input[name="convertMode"]:checked').value;
+    
+    const data = {
+        mode: mode,
+        title: document.getElementById('convertTitle').value,
+        status: document.getElementById('convertStatus').value,
+        priority: document.getElementById('convertPriority').value,
+        due_date: document.getElementById('convertDueDate').value || null
+    };
+    
+    const res = await fetch(`${API_BASE}/items/${itemId}/convert`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify(data)
+    });
+    
+    const result = await res.json();
+    
+    if (result.success) {
+        bootstrap.Modal.getInstance(document.getElementById('convertModal')).hide();
+        
+        if (mode === 'copy') {
+            alert(`已创建新待办，原收藏保留\n新待办ID: ${result.data.id}`);
+        }
+        
+        refreshData();
+        loadReminders();
+    } else {
+        alert(result.error || '转换失败');
+    }
+}
+
 // 删除条目
 async function deleteItem(id) {
     if (!confirm('确认删除?')) return;
@@ -1198,6 +1415,10 @@ async function showDetail(id) {
     document.getElementById('detailTypeIcon').textContent = getTypeIcon(item.type);
     document.getElementById('detailTitle').textContent = item.title || '(无标题)';
     
+    // 非待办类型显示转换按钮
+    const convertBtn = document.getElementById('detailConvertBtn');
+    convertBtn.style.display = item.type !== 'todo' ? 'inline-block' : 'none';
+    
     let html = `<div class="mb-3"><strong>类型:</strong> ${getTypeLabel(item.type)}</div>`;
     
     if (item.url) {
@@ -1249,6 +1470,12 @@ async function showDetail(id) {
     new bootstrap.Modal(document.getElementById('detailModal')).show();
 }
 
+// 从详情页打开转换
+function showConvertModalFromDetail() {
+    bootstrap.Modal.getInstance(document.getElementById('detailModal')).hide();
+    setTimeout(() => showConvertModal(currentDetailId), 300);
+}
+
 // 从详情页打开编辑
 function openEditModalFromDetail() {
     bootstrap.Modal.getInstance(document.getElementById('detailModal')).hide();