feat: Agent 服务日志功能和后端更新

- agent/main.py: 添加日志记录功能
- agent/llm: 更新 anthropic, openai, factory
- agent/core/agent.py: 更新
- server: agent_handler, agent_service, chat_service 更新

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/internal/service/chat_service.go

@@ -16,13 +16,15 @@ import (
 
 type ChatService struct {
 	pythonURL  string
-	agentRepo *repository.AgentRepository
+	agentRepo  *repository.AgentRepository
+	modelRepo *repository.ModelRepository
 }
 
-func NewChatService(pythonURL string, agentRepo *repository.AgentRepository) *ChatService {
+func NewChatService(pythonURL string, agentRepo *repository.AgentRepository, modelRepo *repository.ModelRepository) *ChatService {
 	return &ChatService{
 		pythonURL:  pythonURL,
-		agentRepo: agentRepo,
+		agentRepo:  agentRepo,
+		modelRepo: modelRepo,
 	}
 }
 
@@ -30,9 +32,19 @@ type ChatRequest struct {
 	AgentID   string                 `json:"agent_id"`
 	Message   string                 `json:"message"`
 	SessionID string                 `json:"session_id"`
+	ModelID   string                 `json:"model_id"`
 	Context   map[string]interface{} `json:"context"`
 }
 
+// ModelConfig 模型配置，用于传递给 Python 服务
+type ModelConfig struct {
+	Provider    string `json:"provider"`
+	Model       string `json:"model"`
+	APIKey      string `json:"api_key"`
+	BaseURL     string `json:"base_url"`
+	APIEndpoint string `json:"api_endpoint"`
+}
+
 type ChatResponse struct {
 	Reply     string                 `json:"reply"`
 	SessionID string                 `json:"session_id"`
@@ -59,14 +71,40 @@ func (s *ChatService) Chat(ctx context.Context, userID string, req model.AgentRe
 		sessionID = uuid.New().String()
 	}
 
-	// 4. 调用 Python 服务
+	// 4. 如果提供了 ModelID，获取模型配置
+	var modelConfig *ModelConfig
+	if req.ModelID != "" {
+		modelInfo, err := s.modelRepo.FindByID(req.ModelID)
+		if err != nil {
+			return nil, fmt.Errorf("model not found: %w", err)
+		}
+		modelConfig = &ModelConfig{
+			Provider:    modelInfo.Provider,
+			Model:       modelInfo.Model,
+			APIKey:      modelInfo.APIKey,
+			BaseURL:     modelInfo.BaseURL,
+			APIEndpoint: modelInfo.APIEndpoint,
+		}
+	}
+
+	// 5. 调用 Python 服务
 	pythonReq := ChatRequest{
 		AgentID:   req.AgentID,
 		Message:   req.Message,
 		SessionID: sessionID,
+		ModelID:   req.ModelID,
 		Context:   req.Context,
 	}
 
+	// 将模型配置放入 Context 中传递给 Python 服务
+	if modelConfig != nil {
+		pythonReq.Context = make(map[string]interface{})
+		for k, v := range req.Context {
+			pythonReq.Context[k] = v
+		}
+		pythonReq.Context["model_config"] = modelConfig
+	}
+
 	pythonResp, err := s.callPythonChat(ctx, pythonReq)
 	if err != nil {
 		return nil, fmt.Errorf("failed to call python service: %w", err)