feat: 翻译记录添加不共享开关功能

- Translation 模型新增 no_share 字段
- 管理后台翻译记录页面添加共享状态列和切换按钮
- 不共享的翻译不会被其他用户使用缓存
- 缓存匹配时检查是否有 no_share 标记

admin.py

@@ -255,6 +255,28 @@ def delete_translation(trans_id):
     return jsonify({'success': True})
 
 
+@admin_bp.route('/translation/<int:trans_id>/toggle-share', methods=['POST'])
+@admin_required
+def toggle_translation_share(trans_id):
+    """切换翻译共享状态"""
+    translation = Translation.query.get_or_404(trans_id)
+    translation.no_share = not translation.no_share
+    db.session.commit()
+    
+    # 记录日志
+    log = OperationLog(
+        user_id=session.get('user_id'),
+        username='admin',
+        action='toggle_translation_share',
+        target=f'翻译#{trans_id}',
+        detail=f'设置共享状态为: {not translation.no_share}'
+    )
+    db.session.add(log)
+    db.session.commit()
+    
+    return jsonify({'success': True, 'no_share': translation.no_share})
+
+
 # ==================== 缓存管理 ====================
 @admin_bp.route('/cache')
 @admin_required