feat: 新增回收站功能

- 数据库添加 is_deleted 和 deleted_at 字段
- 删除数据改为移动到回收站（软删除）
- 回收站支持查看、恢复、彻底删除
- 支持一键清空回收站
- 侧边栏添加回收站入口

xian_favor/api.py

@@ -174,6 +174,45 @@ def increment_views(item_id):
     return jsonify({'success': False, 'error': '条目不存在'}), 404
 
 
+@app.route('/api/trash', methods=['GET'])
+def list_trash():
+    """列出回收站数据"""
+    limit = int(request.args.get('limit', 50))
+    offset = int(request.args.get('offset', 0))
+    items = db.list_trash(limit=limit, offset=offset)
+    total = db.count_trash()
+    
+    # 为每个条目添加内容统计
+    for item in items:
+        item['content_stats'] = calculate_content_stats(item)
+    
+    return jsonify({'success': True, 'data': items, 'total': total})
+
+
+@app.route('/api/items/<int:item_id>/restore', methods=['POST'])
+def restore_item(item_id):
+    """从回收站恢复数据"""
+    if db.restore_item(item_id):
+        item = db.get_item(item_id)
+        return jsonify({'success': True, 'data': item})
+    return jsonify({'success': False, 'error': '条目不存在'}), 404
+
+
+@app.route('/api/items/<int:item_id>/permanent', methods=['DELETE'])
+def delete_permanently(item_id):
+    """彻底删除数据"""
+    if db.delete_permanently(item_id):
+        return jsonify({'success': True})
+    return jsonify({'success': False, 'error': '条目不存在'}), 404
+
+
+@app.route('/api/trash', methods=['DELETE'])
+def empty_trash():
+    """清空回收站"""
+    deleted_count = db.empty_trash()
+    return jsonify({'success': True, 'deleted_count': deleted_count})
+
+
 @app.route('/api/items/<int:item_id>/done', methods=['POST'])
 def complete_item(item_id):
     """完成待办"""
@@ -699,6 +738,7 @@ INDEX_TEMPLATE = '''
                 <a href="#" onclick="showTagManager(); return false;"><i class="bi bi-tags"></i> 标签管理</a>
                 <a href="#" onclick="showEmailManager(); return false;"><i class="bi bi-envelope"></i> 邮箱管理</a>
                 <a href="#" onclick="showBackupManager(); return false;"><i class="bi bi-archive"></i> 备份管理</a>
+                <a href="#" onclick="showTrash(); return false;"><i class="bi bi-trash"></i> 回收站</a>
             </nav>
         </div>
         
@@ -2271,6 +2311,130 @@ async function showEmailManager() {
     new bootstrap.Modal(document.getElementById('emailManagerModal')).show();
 }
 
+// ============ 回收站 ============
+
+let trashView = false;
+
+async function showTrash() {
+    trashView = true;
+    await loadTrash();
+    
+    // 更新侧边栏状态
+    document.querySelectorAll('.sidebar a').forEach(a => a.classList.remove('active'));
+}
+
+async function loadTrash() {
+    const res = await fetch(`${API_BASE}/trash`);
+    const data = await res.json();
+    
+    if (data.success) {
+        renderTrash(data.data, data.total);
+    }
+}
+
+function renderTrash(items, total) {
+    const container = document.getElementById('itemList');
+    
+    // 显示回收站标题和操作按钮
+    let header = `
+        <div class="d-flex justify-content-between align-items-center mb-3">
+            <div>
+                <h5><i class="bi bi-trash"></i> 回收站 (${total} 条数据)</h5>
+                <small class="text-muted">删除的数据可在30天内恢复</small>
+            </div>
+            <div>
+                <button class="btn btn-outline-secondary" onclick="hideTrash()">
+                    <i class="bi bi-arrow-left"></i> 返回列表
+                </button>
+                ${total > 0 ? `<button class="btn btn-outline-danger ms-2" onclick="emptyTrash()">
+                    <i class="bi bi-trash-fill"></i> 清空回收站
+                </button>` : ''}
+            </div>
+        </div>
+    `;
+    
+    if (!items.length) {
+        container.innerHTML = header + '<div class="text-center text-muted py-5">回收站为空</div>';
+        return;
+    }
+    
+    container.innerHTML = header + items.map(item => `
+        <div class="card type-${item.type} item-card" style="opacity: 0.7;">
+            <div class="card-body">
+                <div class="d-flex justify-content-between align-items-start">
+                    <div style="flex: 1; min-width: 0;">
+                        <h6 class="card-title text-truncate mb-1">
+                            ${getTypeIcon(item.type)} ${item.title || truncate(item.content || item.url, 30)}
+                        </h6>
+                        <p class="card-text text-muted small mb-0">
+                            删除时间: ${formatShortDate(item.deleted_at)}
+                        </p>
+                    </div>
+                    <div class="d-flex gap-1">
+                        <button class="btn btn-sm btn-outline-success" onclick="restoreItem(${item.id})" title="恢复">
+                            <i class="bi bi-arrow-counterclockwise"></i> 恢复
+                        </button>
+                        <button class="btn btn-sm btn-outline-danger" onclick="deletePermanently(${item.id})" title="彻底删除">
+                            <i class="bi bi-trash-fill"></i>
+                        </button>
+                    </div>
+                </div>
+            </div>
+        </div>
+    `).join('');
+}
+
+async function hideTrash() {
+    trashView = false;
+    refreshData();
+    
+    // 更新侧边栏状态
+    document.querySelector('.sidebar a[data-filter="all"]').classList.add('active');
+}
+
+async function restoreItem(id) {
+    if (!confirm('确认恢复这条数据？')) return;
+    
+    const res = await fetch(`${API_BASE}/items/${id}/restore`, { method: 'POST' });
+    const data = await res.json();
+    
+    if (data.success) {
+        loadTrash();
+        loadStats();
+    } else {
+        alert('恢复失败: ' + data.error);
+    }
+}
+
+async function deletePermanently(id) {
+    if (!confirm('确认彻底删除这条数据？此操作不可恢复！')) return;
+    
+    const res = await fetch(`${API_BASE}/items/${id}/permanent`, { method: 'DELETE' });
+    const data = await res.json();
+    
+    if (data.success) {
+        loadTrash();
+        loadStats();
+    } else {
+        alert('删除失败: ' + data.error);
+    }
+}
+
+async function emptyTrash() {
+    if (!confirm('确认清空回收站？此操作不可恢复！')) return;
+    
+    const res = await fetch(`${API_BASE}/trash`, { method: 'DELETE' });
+    const data = await res.json();
+    
+    if (data.success) {
+        alert(`已清空回收站，删除了 ${data.deleted_count} 条数据`);
+        loadTrash();
+        loadStats();
+    } else {
+        alert('清空失败: ' + data.error);
+    }
+}
+
 // ============ 备份管理 ============
 
 async function showBackupManager() {

xian_favor/db.py

@@ -61,6 +61,8 @@ class Database:
                     note TEXT,
                     is_starred INTEGER DEFAULT 0,
                     views INTEGER DEFAULT 0,
+                    is_deleted INTEGER DEFAULT 0,
+                    deleted_at TEXT,
                     created_at TEXT NOT NULL,
                     updated_at TEXT NOT NULL
                 )
@@ -131,6 +133,16 @@ class Database:
             except sqlite3.OperationalError:
                 cursor.execute("ALTER TABLE items ADD COLUMN views INTEGER DEFAULT 0")
             
+            # 检查并添加 is_deleted 和 deleted_at 字段（兼容旧数据库）
+            try:
+                cursor.execute("SELECT is_deleted FROM items LIMIT 1")
+            except sqlite3.OperationalError:
+                cursor.execute("ALTER TABLE items ADD COLUMN is_deleted INTEGER DEFAULT 0")
+            try:
+                cursor.execute("SELECT deleted_at FROM items LIMIT 1")
+            except sqlite3.OperationalError:
+                cursor.execute("ALTER TABLE items ADD COLUMN deleted_at TEXT")
+            
             conn.commit()
     
     # ============ Item 操作 ============
@@ -192,6 +204,9 @@ class Database:
             params = []
             conditions = []
             
+            # 只显示未删除的数据
+            conditions.append("i.is_deleted = 0")
+            
             # 标签过滤需要JOIN
             if tag:
                 query += " JOIN item_tags it ON i.id = it.item_id JOIN tags t ON it.tag_id = t.id"
@@ -329,13 +344,73 @@ class Database:
             return True
     
     def delete_item(self, item_id: int) -> bool:
-        """删除条目"""
+        """删除条目（移动到回收站）"""
         with self.get_conn() as conn:
             cursor = conn.cursor()
+            now = datetime.now().isoformat()
+            cursor.execute("UPDATE items SET is_deleted = 1, deleted_at = ? WHERE id = ?", (now, item_id))
+            conn.commit()
+            return cursor.rowcount > 0
+    
+    def list_trash(self, limit: int = 50, offset: int = 0) -> List[Dict[str, Any]]:
+        """列出回收站数据"""
+        with self.get_conn() as conn:
+            cursor = conn.cursor()
+            cursor.execute("SELECT * FROM items WHERE is_deleted = 1 ORDER BY deleted_at DESC LIMIT ? OFFSET ?", (limit, offset))
+            items = []
+            for row in cursor.fetchall():
+                item = dict(row)
+                item['tags'] = self._get_item_tags(conn, item['id'])
+                items.append(item)
+            return items
+    
+    def count_trash(self) -> int:
+        """计算回收站数据总数"""
+        with self.get_conn() as conn:
+            cursor = conn.cursor()
+            cursor.execute("SELECT COUNT(*) as count FROM items WHERE is_deleted = 1")
+            return cursor.fetchone()['count']
+    
+    def restore_item(self, item_id: int) -> bool:
+        """从回收站恢复数据"""
+        with self.get_conn() as conn:
+            cursor = conn.cursor()
+            cursor.execute("UPDATE items SET is_deleted = 0, deleted_at = NULL WHERE id = ?", (item_id,))
+            conn.commit()
+            return cursor.rowcount > 0
+    
+    def delete_permanently(self, item_id: int) -> bool:
+        """彻底删除数据（从数据库中删除）"""
+        with self.get_conn() as conn:
+            cursor = conn.cursor()
+            # 删除标签关联
+            cursor.execute("DELETE FROM item_tags WHERE item_id = ?", (item_id,))
+            # 删除邮件发送记录
+            cursor.execute("DELETE FROM email_logs WHERE item_id = ?", (item_id,))
+            # 删除数据
             cursor.execute("DELETE FROM items WHERE id = ?", (item_id,))
             conn.commit()
             return cursor.rowcount > 0
     
+    def empty_trash(self) -> int:
+        """清空回收站"""
+        with self.get_conn() as conn:
+            cursor = conn.cursor()
+            # 获取所有回收站数据ID
+            cursor.execute("SELECT id FROM items WHERE is_deleted = 1")
+            ids = [row['id'] for row in cursor.fetchall()]
+            
+            # 删除所有关联数据
+            for item_id in ids:
+                cursor.execute("DELETE FROM item_tags WHERE item_id = ?", (item_id,))
+                cursor.execute("DELETE FROM email_logs WHERE item_id = ?", (item_id,))
+            
+            # 删除所有回收站数据
+            cursor.execute("DELETE FROM items WHERE is_deleted = 1")
+            deleted_count = cursor.rowcount
+            conn.commit()
+            return deleted_count
+    
     def toggle_star(self, item_id: int) -> bool:
         """切换重点关注状态"""
         with self.get_conn() as conn: