feat(skills and model):

1. Add the "Skills" module;
 2. The loading of the model square has been modified to be controlled through environment variables;
 3. Dynamic scheduling of the skill binding tool;
 4. Agent Integration Skills

api/app/core/agent/agent_middleware.py

@@ -0,0 +1,151 @@
+"""Agent Middleware - 动态技能过滤"""
+import uuid
+from typing import List, Dict, Any, Optional
+from langchain_core.runnables import RunnablePassthrough
+
+from app.services.skill_service import SkillService
+from app.repositories.skill_repository import SkillRepository
+
+
+class AgentMiddleware:
+    """Agent 中间件 - 用于动态过滤和加载技能"""
+    
+    def __init__(self, skill_ids: Optional[List[str]] = None):
+        """
+        初始化中间件
+        
+        Args:
+            skill_ids: 技能ID列表
+        """
+        self.skill_ids = skill_ids or []
+
+    @staticmethod
+    def filter_tools(
+        tools: List, 
+        message: str = "", 
+        skill_configs: Dict[str, Any] = None,
+        tool_to_skill_map: Dict[str, str] = None
+    ) -> tuple[List, List[str]]:
+        """
+        根据消息内容和技能配置动态过滤工具
+        
+        Args:
+            tools: 所有可用工具列表
+            message: 用户消息（可用于智能过滤）
+            skill_configs: 技能配置字典 {skill_id: {"keywords": [...], "enabled": True, "prompt": "..."}}
+            tool_to_skill_map: 工具到技能的映射 {tool_name: skill_id}
+        
+        Returns:
+            (过滤后的工具列表, 激活的技能ID列表)
+        """
+        if not tools:
+            return [], []
+        
+        # 如果没有技能配置，返回所有工具
+        if not skill_configs:
+            return tools, []
+        
+        # 基于关键词匹配激活技能
+        activated_skill_ids = []
+        message_lower = message.lower()
+        
+        for skill_id, config in skill_configs.items():
+            if not config.get('enabled', True):
+                continue
+            
+            keywords = config.get('keywords', [])
+            # 如果没有关键词限制，或消息包含关键词，则激活该技能
+            if not keywords or any(kw.lower() in message_lower for kw in keywords):
+                activated_skill_ids.append(skill_id)
+        
+        # 如果没有工具映射关系，返回所有工具
+        if not tool_to_skill_map:
+            return tools, activated_skill_ids
+        
+        # 根据激活的技能过滤工具
+        filtered_tools = []
+        for tool in tools:
+            tool_name = getattr(tool, 'name', str(id(tool)))
+            # 如果工具不属于任何skill（base_tools），或者工具所属的skill被激活，则保留
+            if tool_name not in tool_to_skill_map or tool_to_skill_map[tool_name] in activated_skill_ids:
+                filtered_tools.append(tool)
+        
+        return filtered_tools, activated_skill_ids
+    
+    def load_skill_tools(self, db, tenant_id: uuid.UUID, base_tools: List = None) -> tuple[List, Dict[str, Any], Dict[str, str]]:
+        """
+        加载技能关联的工具
+        
+        Args:
+            db: 数据库会话
+            tenant_id: 租户id
+            base_tools: 基础工具列表
+        
+        Returns:
+            (工具列表, 技能配置字典, 工具到技能的映射 {tool_name: skill_id})
+        """
+
+        tools_dict = {}
+        tool_to_skill_map = {}  # 工具名称到技能ID的映射
+        
+        if base_tools:
+            for tool in base_tools:
+                tool_name = getattr(tool, 'name', str(id(tool)))
+                tools_dict[tool_name] = tool
+                # base_tools 不属于任何 skill，不加入映射
+
+        skill_configs = {}
+        
+        if self.skill_ids:
+            for skill_id in self.skill_ids:
+                try:
+                    skill = SkillRepository.get_by_id(db, uuid.UUID(skill_id), tenant_id)
+                    if skill and skill.is_active:
+                        # 保存技能配置（包含prompt）
+                        config = skill.config or {}
+                        config['prompt'] = skill.prompt
+                        config['name'] = skill.name
+                        skill_configs[skill_id] = config
+                except Exception:
+                    continue
+            
+            # 加载技能工具并获取映射关系
+            skill_tools, skill_tool_map = SkillService.load_skill_tools(db, self.skill_ids, tenant_id)
+            
+            # 只添加不冲突的 skill_tools
+            for tool in skill_tools:
+                tool_name = getattr(tool, 'name', str(id(tool)))
+                if tool_name not in tools_dict:
+                    tools_dict[tool_name] = tool
+                    # 复制映射关系
+                    if tool_name in skill_tool_map:
+                        tool_to_skill_map[tool_name] = skill_tool_map[tool_name]
+        
+        return list(tools_dict.values()), skill_configs, tool_to_skill_map
+
+    @staticmethod
+    def get_active_prompts(activated_skill_ids: List[str], skill_configs: Dict[str, Any]) -> str:
+        """
+        根据激活的技能ID获取对应的提示词
+        
+        Args:
+            activated_skill_ids: 被激活的技能ID列表
+            skill_configs: 技能配置字典
+        
+        Returns:
+            合并后的提示词
+        """
+        prompts = []
+        for skill_id in activated_skill_ids:
+            config = skill_configs.get(skill_id, {})
+            prompt = config.get('prompt')
+            name = config.get('name', 'Skill')
+            if prompt:
+                prompts.append(f"# {name}\n{prompt}")
+        
+        return "\n\n".join(prompts) if prompts else ""
+
+    @staticmethod
+    def create_runnable():
+        """创建可运行的中间件"""
+        return RunnablePassthrough()