feat: 增强 Agent 系统和完善项目结构

主要改进:
- Agent 增强: 订单查询、售后支持、客服路由等功能优化
- 新增语言检测和 Token 管理模块
- 改进 Chatwoot webhook 处理和用户标识
- MCP 服务器增强: 订单 MCP 和 Strapi MCP 功能扩展
- 新增商城客户端、知识库、缓存和同步模块
- 添加多语言提示词系统 (YAML)
- 完善项目结构: 整理文档、脚本和测试文件
- 新增调试和测试工具脚本

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

agent/test_endpoint.py

@@ -0,0 +1,55 @@
+"""
+测试端点 - 用于测试退货 FAQ
+"""
+from fastapi import APIRouter, HTTPException
+from pydantic import BaseModel
+
+from core.graph import process_message
+
+router = APIRouter(prefix="/test", tags=["test"])
+
+
+class TestRequest(BaseModel):
+    """测试请求"""
+    conversation_id: str
+    user_id: str
+    account_id: str
+    message: str
+    history: list = []
+    context: dict = {}
+
+
+@router.post("/faq")
+async def test_faq(request: TestRequest):
+    """测试 FAQ 回答
+
+    简化的测试端点，用于测试退货相关 FAQ
+    """
+    try:
+        # 调用处理流程
+        result = await process_message(
+            conversation_id=request.conversation_id,
+            user_id=request.user_id,
+            account_id=request.account_id,
+            message=request.message,
+            history=request.history,
+            context=request.context
+        )
+
+        return {
+            "success": True,
+            "response": result.get("response"),
+            "intent": result.get("intent"),
+            "tool_calls": result.get("tool_calls", []),
+            "step_count": result.get("step_count", 0)
+        }
+
+    except Exception as e:
+        import traceback
+        traceback.print_exc()
+
+        return {
+            "success": False,
+            "error": str(e),
+            "response": None
+        }