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/prompts/base.py

@@ -0,0 +1,110 @@
+"""
+Multi-language Prompt Loader
+
+Loads system prompts for different agents in different languages.
+"""
+import yaml
+from pathlib import Path
+from typing import Optional
+from utils.logger import get_logger
+
+logger = get_logger(__name__)
+
+# Base directory for prompt templates
+PROMPTS_DIR = Path(__file__).parent
+
+# Supported locales
+SUPPORTED_LOCALES = ["en", "nl", "de", "es", "fr", "it", "tr"]
+
+# Default locale
+DEFAULT_LOCALE = "en"
+
+
+class PromptLoader:
+    """Load and cache prompt templates for different languages"""
+
+    def __init__(self):
+        self._cache = {}
+
+    def get_prompt(self, agent_type: str, locale: str) -> str:
+        """Get system prompt for agent type and locale
+
+        Args:
+            agent_type: Type of agent (customer_service, aftersale, order, product, router)
+            locale: Language locale (en, nl, de, etc.)
+
+        Returns:
+            System prompt string
+        """
+        # Validate locale
+        if locale not in SUPPORTED_LOCALES:
+            logger.warning(
+                "Unsupported locale, using default",
+                requested_locale=locale,
+                default_locale=DEFAULT_LOCALE
+            )
+            locale = DEFAULT_LOCALE
+
+        # Check cache
+        cache_key = f"{agent_type}:{locale}"
+        if cache_key in self._cache:
+            return self._cache[cache_key]
+
+        # Load prompt file
+        prompt_file = PROMPTS_DIR / agent_type / f"{locale}.yaml"
+
+        if not prompt_file.exists():
+            logger.warning(
+                "Prompt file not found, using default",
+                agent_type=agent_type,
+                locale=locale,
+                file=str(prompt_file)
+            )
+            # Fallback to English
+            prompt_file = PROMPTS_DIR / agent_type / f"{DEFAULT_LOCALE}.yaml"
+
+        if not prompt_file.exists():
+            # Fallback to hardcoded English prompt
+            logger.error("No prompt file found, using fallback", agent_type=agent_type)
+            return self._get_fallback_prompt(agent_type)
+
+        # Load and parse YAML
+        try:
+            with open(prompt_file, 'r', encoding='utf-8') as f:
+                data = yaml.safe_load(f)
+
+            prompt = data.get('system_prompt', '')
+            self._cache[cache_key] = prompt
+            return prompt
+
+        except Exception as e:
+            logger.error("Failed to load prompt file", file=str(prompt_file), error=str(e))
+            return self._get_fallback_prompt(agent_type)
+
+    def _get_fallback_prompt(self, agent_type: str) -> str:
+        """Get fallback prompt if file loading fails"""
+        fallbacks = {
+            "customer_service": """You are a professional B2B customer service assistant. Help users with their questions.""",
+            "aftersale": """You are a professional B2B aftersale service assistant. Help users with returns and exchanges.""",
+            "order": """You are a professional B2B order assistant. Help users with order inquiries.""",
+            "product": """You are a professional B2B product assistant. Help users find products.""",
+            "router": """You are an AI assistant that routes user messages to appropriate agents."""
+        }
+        return fallbacks.get(agent_type, "You are a helpful AI assistant.")
+
+
+# Global loader instance
+_loader = PromptLoader()
+
+
+def get_prompt(agent_type: str, locale: str) -> str:
+    """Get system prompt for agent type and locale
+
+    Args:
+        agent_type: Type of agent (customer_service, aftersale, order, product, router)
+        locale: Language locale (en, nl, de, etc.)
+
+    Returns:
+        System prompt string
+    """
+    return _loader.get_prompt(agent_type, locale)