refactor: 备用大模型整合到大模型配置页

- 备用大模型不再单独页面，直接在大模型配置页显示
- 新增/编辑使用模态框，更简洁高效
- 移除独立的 backup_llm.html 和 backup_llm_form.html
- 统一侧边栏导航，移除备用大模型链接
- API 改为只返回 JSON，不再渲染页面

admin.py

@@ -686,7 +686,10 @@ def llm_config():
         'timeout': DynamicConfig.get('llm_timeout', LLM_CONFIG.get('timeout')),
     }
     
-    return render_template('admin/llm_config.html', config=config)
+    # 获取备用大模型配置
+    backup_configs = BackupLLMConfig.query.order_by(BackupLLMConfig.sort_order).all()
+    
+    return render_template('admin/llm_config.html', config=config, backup_configs=[c.to_dict() for c in backup_configs])
 
 
 @admin_bp.route('/llm_config/save', methods=['POST'])
@@ -1224,92 +1227,72 @@ def get_all_membership_plans():
 @admin_bp.route('/backup-llm')
 @admin_required
 def backup_llm_list():
-    """备用大模型接口列表"""
-    configs = BackupLLMConfig.query.order_by(BackupLLMConfig.sort_order).all()
-    
-    # 如果数据库中没有数据，初始化默认配置
-    if not configs:
-        init_default_backup_llm()
-        configs = BackupLLMConfig.query.order_by(BackupLLMConfig.sort_order).all()
-    
-    return render_template('admin/backup_llm.html', configs=configs)
+    """备用大模型接口列表 - 重定向到大模型配置页"""
+    return redirect(url_for('admin.llm_config'))
 
 
-@admin_bp.route('/backup-llm/add', methods=['GET', 'POST'])
+@admin_bp.route('/backup-llm/add', methods=['POST'])
 @admin_required
 def add_backup_llm():
     """添加备用大模型接口"""
-    if request.method == 'POST':
-        data = request.json if request.is_json else request.form
-        
-        config = BackupLLMConfig(
-            provider_name=data.get('provider_name'),
-            api_base=data.get('api_base'),
-            api_key=data.get('api_key'),
-            model=data.get('model'),
-            is_active=data.get('is_active', True) if isinstance(data.get('is_active'), bool) else data.get('is_active') == 'true',
-            sort_order=int(data.get('sort_order', 0)),
-            description=data.get('description'),
-        )
-        
-        db.session.add(config)
-        db.session.commit()
-        
-        # 记录日志
-        log = OperationLog(
-            user_id=session.get('user_id'),
-            username='admin',
-            action='add_backup_llm',
-            target=config.provider_name,
-            detail=json.dumps(config.to_dict(), ensure_ascii=False)
-        )
-        db.session.add(log)
-        db.session.commit()
-        
-        if request.is_json:
-            return jsonify({'success': True, 'config': config.to_dict()})
-        flash('备用大模型接口已添加', 'success')
-        return redirect(url_for('admin.backup_llm_list'))
+    data = request.json
     
-    return render_template('admin/backup_llm_form.html', config=None)
+    config = BackupLLMConfig(
+        provider_name=data.get('provider_name'),
+        api_base=data.get('api_base'),
+        api_key=data.get('api_key'),
+        model=data.get('model'),
+        is_active=data.get('is_active', True),
+        sort_order=int(data.get('sort_order', 0)),
+        description=data.get('description'),
+    )
+    
+    db.session.add(config)
+    db.session.commit()
+    
+    # 记录日志
+    log = OperationLog(
+        user_id=session.get('user_id'),
+        username='admin',
+        action='add_backup_llm',
+        target=config.provider_name,
+        detail=json.dumps(config.to_dict(), ensure_ascii=False)
+    )
+    db.session.add(log)
+    db.session.commit()
+    
+    return jsonify({'success': True, 'config': config.to_dict()})
 
 
-@admin_bp.route('/backup-llm/<int:config_id>/edit', methods=['GET', 'POST'])
+@admin_bp.route('/backup-llm/<int:config_id>/edit', methods=['POST'])
 @admin_required
 def edit_backup_llm(config_id):
     """编辑备用大模型接口"""
     config = BackupLLMConfig.query.get_or_404(config_id)
+    data = request.json
     
-    if request.method == 'POST':
-        data = request.json if request.is_json else request.form
-        
-        config.provider_name = data.get('provider_name', config.provider_name)
-        config.api_base = data.get('api_base', config.api_base)
-        config.api_key = data.get('api_key', config.api_key)
-        config.model = data.get('model', config.model)
-        config.is_active = data.get('is_active', True) if isinstance(data.get('is_active'), bool) else data.get('is_active') == 'true'
-        config.sort_order = int(data.get('sort_order', config.sort_order))
-        config.description = data.get('description', config.description)
-        
-        db.session.commit()
-        
-        # 记录日志
-        log = OperationLog(
-            user_id=session.get('user_id'),
-            username='admin',
-            action='edit_backup_llm',
-            target=config.provider_name,
-            detail=json.dumps(config.to_dict(), ensure_ascii=False)
-        )
-        db.session.add(log)
-        db.session.commit()
-        
-        if request.is_json:
-            return jsonify({'success': True, 'config': config.to_dict()})
-        flash('备用大模型接口已更新', 'success')
-        return redirect(url_for('admin.backup_llm_list'))
+    config.provider_name = data.get('provider_name', config.provider_name)
+    config.api_base = data.get('api_base', config.api_base)
+    config.api_key = data.get('api_key', config.api_key)
+    config.model = data.get('model', config.model)
+    config.is_active = data.get('is_active', True)
+    config.sort_order = int(data.get('sort_order', config.sort_order))
+    config.description = data.get('description', config.description)
     
-    return render_template('admin/backup_llm_form.html', config=config)
+    db.session.commit()
+    
+    # 记录日志
+    log = OperationLog(
+        user_id=session.get('user_id'),
+        username='admin',
+        action='edit_backup_llm',
+        target=config.provider_name,
+        detail=json.dumps(config.to_dict(), ensure_ascii=False)
+    )
+    db.session.add(log)
+    db.session.commit()
+    
+    return jsonify({'success': True, 'config': config.to_dict()})
 
 
 @admin_bp.route('/backup-llm/<int:config_id>/delete', methods=['POST'])