feat: 新增 Agent、Memory、Skill 模块

- handler: agent_handler, memory_handler, skill_handler
- model: agent.go, skill.go
- repository: agent_repo, skill_repo
- service: agent_service, memory_service, skill_service
- 新增 migrations 目录

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

server/internal/service/agent_service.go

@@ -0,0 +1,145 @@
+package service
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+)
+
+// AgentChatRequest Python Agent 对话请求
+type AgentChatRequest struct {
+	AgentID   int    `json:"agent_id"`
+	Message   string `json:"message"`
+	UserID    int    `json:"user_id"`
+	SessionID string `json:"session_id,omitempty"`
+}
+
+// AgentChatResponse Python Agent 对话响应
+type AgentChatResponse struct {
+	AgentID    int             `json:"agent_id"`
+	Response   string          `json:"response"`
+	ToolCalls  []interface{}   `json:"tool_calls"`
+	TokensUsed int            `json:"tokens_used"`
+	DurationMs int            `json:"duration_ms"`
+	SessionID  string         `json:"session_id"`
+}
+
+// TeamChatRequest 多智能体群聊请求
+type TeamChatRequest struct {
+	SupervisorAgentID int      `json:"supervisor_agent_id"`
+	MemberAgentIDs    []int    `json:"member_agent_ids"`
+	Message          string   `json:"message"`
+	UserID           int      `json:"user_id"`
+	SessionID        string   `json:"session_id,omitempty"`
+	Strategy         string   `json:"strategy,omitempty"`
+}
+
+// TeamChatResponse 多智能体群聊响应
+type TeamChatResponse struct {
+	SupervisorAgentID int             `json:"supervisor_agent_id"`
+	Response         string          `json:"response"`
+	SubtaskResults   []interface{}   `json:"subtask_results"`
+	Strategy         string          `json:"strategy"`
+	DurationMs       int             `json:"duration_ms"`
+	SessionID        string          `json:"session_id"`
+}
+
+// AgentService Python Agent 服务
+type AgentService struct {
+	pythonURL string
+	client    *http.Client
+}
+
+// NewAgentService 创建 Agent 服务
+func NewAgentService(pythonURL string) *AgentService {
+	return &AgentService{
+		pythonURL: pythonURL,
+		client: &http.Client{
+			Timeout: 120 * time.Second, // Agent 可能需要较长时间
+		},
+	}
+}
+
+// Chat 单智能体对话
+func (s *AgentService) Chat(req AgentChatRequest) (*AgentChatResponse, error) {
+	url := fmt.Sprintf("%s/agent/chat", s.pythonURL)
+
+	jsonData, err := json.Marshal(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal request: %w", err)
+	}
+
+	httpReq, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+	httpReq.Header.Set("Content-Type", "application/json")
+
+	resp, err := s.client.Do(httpReq)
+	if err != nil {
+		return nil, fmt.Errorf("failed to call python agent: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("python agent error: %s", string(body))
+	}
+
+	var result AgentChatResponse
+	if err := json.Unmarshal(body, &result); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal response: %w", err)
+	}
+
+	return &result, nil
+}
+
+// TeamChat 多智能体群聊
+func (s *AgentService) TeamChat(req TeamChatRequest) (*TeamChatResponse, error) {
+	url := fmt.Sprintf("%s/agent/team/chat", s.pythonURL)
+
+	// 设置默认策略
+	if req.Strategy == "" {
+		req.Strategy = "parallel"
+	}
+
+	jsonData, err := json.Marshal(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal request: %w", err)
+	}
+
+	httpReq, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+	httpReq.Header.Set("Content-Type", "application/json")
+
+	resp, err := s.client.Do(httpReq)
+	if err != nil {
+		return nil, fmt.Errorf("failed to call python agent: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("python agent error: %s", string(body))
+	}
+
+	var result TeamChatResponse
+	if err := json.Unmarshal(body, &result); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal response: %w", err)
+	}
+
+	return &result, nil
+}