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/core/state.py

@@ -65,6 +65,7 @@ class AgentState(TypedDict):
     conversation_id: str              # Chatwoot conversation ID
     user_id: str                      # User identifier
     account_id: str                   # B2B account identifier
+    user_token: Optional[str]         # User JWT token for API calls
     
     # ============ Message Content ============
     messages: list[dict[str, Any]]    # Conversation history [{role, content}]
@@ -74,6 +75,10 @@ class AgentState(TypedDict):
     intent: Optional[str]             # Recognized intent (Intent enum value)
     intent_confidence: float          # Intent confidence score (0-1)
     sub_intent: Optional[str]         # Sub-intent for more specific routing
+
+    # ============ Language Detection ============
+    detected_language: Optional[str]  # Detected user language (en, nl, de, etc.)
+    language_confidence: float        # Language detection confidence (0-1)
     
     # ============ Entity Extraction ============
     entities: dict[str, Any]          # Extracted entities {type: value}
@@ -111,10 +116,11 @@ def create_initial_state(
     account_id: str,
     current_message: str,
     messages: Optional[list[dict[str, Any]]] = None,
-    context: Optional[dict[str, Any]] = None
+    context: Optional[dict[str, Any]] = None,
+    user_token: Optional[str] = None
 ) -> AgentState:
     """Create initial agent state for a new message
-    
+
     Args:
         conversation_id: Chatwoot conversation ID
         user_id: User identifier
@@ -122,7 +128,8 @@ def create_initial_state(
         current_message: User's message to process
         messages: Previous conversation history
         context: Existing conversation context
-        
+        user_token: User JWT token for API calls
+
     Returns:
         Initialized AgentState
     """
@@ -131,6 +138,7 @@ def create_initial_state(
         conversation_id=conversation_id,
         user_id=user_id,
         account_id=account_id,
+        user_token=user_token,
         
         # Messages
         messages=messages or [],
@@ -140,6 +148,10 @@ def create_initial_state(
         intent=None,
         intent_confidence=0.0,
         sub_intent=None,
+
+        # Language
+        detected_language=None,
+        language_confidence=0.0,
         
         # Entities
         entities={},
@@ -270,3 +282,21 @@ def mark_finished(state: AgentState) -> AgentState:
     state["finished"] = True
     state["state"] = ConversationState.COMPLETED.value
     return state
+
+
+def set_language(state: AgentState, language: str, confidence: float) -> AgentState:
+    """Set the detected language in state
+
+    Args:
+        state: Agent state
+        language: Detected locale code (en, nl, de, etc.)
+        confidence: Detection confidence (0-1)
+
+    Returns:
+        Updated state
+    """
+    state["detected_language"] = language
+    state["language_confidence"] = confidence
+    # Also cache in context for future reference
+    state["context"]["language"] = language
+    return state