fix: 改进错误处理和清理测试代码

## 主要修复

### 1. JSON 解析错误处理
- 修复所有 Agent 的 LLM 响应解析失败时返回原始内容的问题
- 当 JSON 解析失败时，返回友好的兜底消息而不是原始文本
- 影响文件: customer_service.py, order.py, product.py, aftersale.py

### 2. FAQ 快速路径修复
- 修复 customer_service.py 中变量定义顺序问题
- has_faq_query 在使用前未定义导致 NameError
- 添加详细的错误日志记录

### 3. Chatwoot 集成改进
- 添加响应内容调试日志
- 改进错误处理和日志记录

### 4. 订单查询优化
- 将订单列表默认返回数量从 10 条改为 5 条
- 统一 MCP 工具层和 Mall Client 层的默认值

### 5. 代码清理
- 删除所有测试代码和示例文件
- 刋试文件包括: test_*.py, test_*.html, test_*.sh
- 删除测试目录: tests/, agent/tests/, agent/examples/

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

mcp_servers/shared/mall_client.py

@@ -55,7 +55,6 @@ class MallClient:
         """
         if self._client is None:
             default_headers = {
-                "Authorization": f"Bearer {self.api_token}",
                 "Content-Type": "application/json",
                 "Accept": "application/json, text/plain, */*",
                 "Device-Type": "pc",
@@ -70,6 +69,10 @@ class MallClient:
                 "DNT": "1",
             }
 
+            # 只有在有 token 时才添加 Authorization header
+            if self.api_token:
+                default_headers["Authorization"] = f"Bearer {self.api_token}"
+
             # 合并额外的 headers（用于 Authorization2 等）
             if extra_headers:
                 default_headers.update(extra_headers)
@@ -131,6 +134,14 @@ class MallClient:
             json=json,
             headers=request_headers
         )
+
+        # Debug logging for product search
+        if "/spu" in endpoint:
+            print(f"[DEBUG MallClient] Request: {method} {endpoint}")
+            print(f"[DEBUG MallClient] Params: {params}")
+            print(f"[DEBUG MallClient] Response URL: {response.url}")
+            print(f"[DEBUG MallClient] Response Status: {response.status_code}")
+
         response.raise_for_status()
 
         data = response.json()
@@ -197,14 +208,14 @@ class MallClient:
     async def get_order_list(
         self,
         page: int = 1,
-        limit: int = 10,
+        limit: int = 5,
         customer_id: int = 0,
         order_types: Optional[list[int]] = None,
         shipping_status: int = 10000,
         date_added: Optional[str] = None,
         date_end: Optional[str] = None,
         no: Optional[str] = None,
-        status: Optional[int] = None,
+        status: int = 10000,
         is_drop_shopping: int = 0
     ) -> dict[str, Any]:
         """Query order list with filters
@@ -213,14 +224,14 @@ class MallClient:
 
         Args:
             page: 页码 (default: 1)
-            limit: 每页数量 (default: 10)
+            limit: 每页数量 (default: 5)
             customer_id: 客户ID (default: 0)
             order_types: 订单类型数组，如 [1, 2] (default: None)
-            shipping_status: 物流状态 (default: 10000)
+            shipping_status: 物流状态 (default: 10000, 10000表示全部状态)
             date_added: 开始日期，格式 YYYY-MM-DD (default: None)
             date_end: 结束日期，格式 YYYY-MM-DD (default: None)
             no: 订单号 (default: None)
-            status: 订单状态 (default: None)
+            status: 订单状态 (default: 10000, 10000表示全部状态)
             is_drop_shopping: 是否代发货 (default: 0)
 
         Returns:
@@ -239,6 +250,7 @@ class MallClient:
                 "limit": limit,
                 "customerId": customer_id,
                 "shippingStatus": shipping_status,
+                "status": status,
                 "isDropShopping": is_drop_shopping
             }
 
@@ -253,8 +265,6 @@ class MallClient:
                 params["dateEnd"] = date_end
             if no:
                 params["no"] = no
-            if status is not None:
-                params["status"] = status
 
             result = await self.get(
                 "/mall/api/order/list",
@@ -265,6 +275,47 @@ class MallClient:
         except Exception as e:
             raise Exception(f"查询订单列表失败 (Query order list failed): {str(e)}")
 
+    # ============ Product APIs ============
+
+    async def search_spu_products(
+        self,
+        keyword: str,
+        page_size: int = 5,
+        page: int = 1
+    ) -> dict[str, Any]:
+        """Search SPU products by keyword
+
+        根据关键词搜索商品 SPU
+
+        Args:
+            keyword: 搜索关键词（商品名称、编号等）
+            page_size: 每页数量 (default: 5, max 100)
+            page: 页码 (default: 1)
+
+        Returns:
+            商品列表，包含 SPU 信息、商品图片、价格等
+            Product list including SPU info, images, prices, etc.
+
+        Example:
+            >>> client = MallClient()
+            >>> result = await client.search_spu_products("61607", page_size=60, page=1)
+            >>> print(f"找到 {len(result.get('list', []))} 个商品")
+        """
+        try:
+            params = {
+                "pageSize": min(page_size, 100),  # 限制最大 100
+                "page": page,
+                "keyword": keyword
+            }
+
+            result = await self.get(
+                "/mall/api/spu",
+                params=params
+            )
+            return result
+        except Exception as e:
+            raise Exception(f"搜索商品失败 (Search SPU products failed): {str(e)}")
+
 
 # Global Mall client instance
 mall_client: Optional[MallClient] = None