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/model/agent.go

@@ -15,10 +15,10 @@ const (
 
 // Agent 智能体
 type Agent struct {
-	ID          string   `json:"id" gorm:"primaryKey"`
-	Name        string   `json:"name" gorm:"size:100;not null"`
-	Description string   `json:"description" gorm:"type:text"`
-	OwnerID     string   `json:"owner_id" gorm:"size:50;not null;index"`
+	ID                string   `json:"id" gorm:"primaryKey"`
+	Name              string   `json:"name" gorm:"size:100;not null"`
+	Description       string   `json:"description" gorm:"type:text"`
+	OwnerID           string   `json:"owner_id" gorm:"size:50;not null;index"`
 
 	// Agent能力配置
 	Capabilities []string `json:"capabilities" gorm:"type:text"` // JSON数组，可用工具列表
@@ -29,6 +29,14 @@ type Agent struct {
 	SecurityLevel       SecurityLevel `json:"security_level" gorm:"size:20;default:'safe'"`
 	AllowDangerousTools bool          `json:"allow_dangerous_tools" gorm:"default:false"`
 
+	// 扩展字段：角色描述和模型配置
+	RoleDescription string `json:"role_description" gorm:"type:text"` // 角色描述 (System Prompt)
+	ModelProvider   string `json:"model_provider" gorm:"size:50"`    // 模型提供商: openai/anthropic
+	ModelName       string `json:"model_name" gorm:"size:100"`        // 模型名称
+
+	// 协作模式
+	IsSupervisor bool `json:"is_supervisor" gorm:"default:false"` // 是否为主智能体
+
 	// 状态
 	IsActive bool `json:"is_active" gorm:"default:true"`
 
@@ -36,6 +44,62 @@ type Agent struct {
 	UpdatedAt time.Time `json:"updated_at"`
 }
 
+// AgentSkill 智能体-技能绑定
+type AgentSkill struct {
+	ID          string                 `json:"id" gorm:"primaryKey"`
+	AgentID     string                 `json:"agent_id" gorm:"size:191;index"`
+	SkillID     string                 `json:"skill_id" gorm:"size:191;index"`
+	SkillConfig string                 `json:"skill_config" gorm:"type:text"` // JSON 配置
+	CreatedAt   time.Time              `json:"created_at"`
+	UpdatedAt   time.Time              `json:"updated_at"`
+}
+
+// AgentKnowledgeBase 智能体-知识库绑定
+type AgentKnowledgeBase struct {
+	ID               string    `json:"id" gorm:"primaryKey"`
+	AgentID          string    `json:"agent_id" gorm:"size:191;index"`
+	KnowledgeBaseID  string    `json:"knowledge_base_id" gorm:"size:191;index"`
+	CreatedAt        time.Time `json:"created_at"`
+	UpdatedAt        time.Time `json:"updated_at"`
+}
+
+// AgentMemory 长期记忆
+type AgentMemory struct {
+	ID          string    `json:"id" gorm:"primaryKey"`
+	AgentID     string    `json:"agent_id" gorm:"size:191;index"`
+	UserID      string    `json:"user_id" gorm:"size:191;index"`
+	Content     string    `json:"content" gorm:"type:text"`
+	MemoryType  string    `json:"memory_type" gorm:"size:20"` // experience/preference/conversation
+	Importance  int       `json:"importance" gorm:"default:5"`
+	CreatedAt   time.Time `json:"created_at"`
+	UpdatedAt   time.Time `json:"updated_at"`
+}
+
+// AgentTeam 多智能体协作配置
+type AgentTeam struct {
+	ID               string    `json:"id" gorm:"primaryKey"`
+	SupervisorAgentID string    `json:"supervisor_agent_id" gorm:"size:191;index"`
+	MemberAgentID    string    `json:"member_agent_id" gorm:"size:191;index"`
+	DispatchStrategy string    `json:"dispatch_strategy" gorm:"size:20;default:'parallel'"`
+	CreatedAt        time.Time `json:"created_at"`
+	UpdatedAt        time.Time `json:"updated_at"`
+}
+
+// AgentTask 任务记录
+type AgentTask struct {
+	ID            string    `json:"id" gorm:"primaryKey"`
+	AgentID       string    `json:"agent_id" gorm:"size:191;index"`
+	UserID        string    `json:"user_id" gorm:"size:191;index"`
+	UserInput     string    `json:"user_input" gorm:"type:text"`
+	AgentResponse string    `json:"agent_response" gorm:"type:text"`
+	Status        string    `json:"status" gorm:"size:20"` // pending/running/completed/failed
+	TokensUsed    int       `json:"tokens_used" gorm:"default:0"`
+	DurationMs    int       `json:"duration_ms"`
+	SessionID     string    `json:"session_id" gorm:"size:191;index"`
+	CreatedAt     time.Time `json:"created_at"`
+	CompletedAt   time.Time `json:"completed_at"`
+}
+
 // AgentRequest 聊天请求
 type AgentRequest struct {
 	AgentID   string                 `json:"agent_id" binding:"required"`

server/internal/model/skill.go

@@ -0,0 +1,28 @@
+package model
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+// Skill 技能
+type Skill struct {
+	ID          string    `json:"id" gorm:"primaryKey"`
+	SkillName   string    `json:"skill_name" gorm:"size:200;not null"`
+	SkillType   string    `json:"skill_type" gorm:"size:20;not null"` // system / user
+	SkillDesc   string    `json:"skill_desc" gorm:"type:text"`
+	Path        string    `json:"path" gorm:"size:500"`               // skill 文件路径
+	Status      string    `json:"status" gorm:"size:20;default:'active'"`
+	CreatedAt   time.Time `json:"created_at"`
+	UpdatedAt   time.Time `json:"updated_at"`
+}
+
+// BeforeCreate 创建前自动生成ID
+func (s *Skill) BeforeCreate(tx *gorm.DB) error {
+	if s.ID == "" {
+		s.ID = uuid.New().String()
+	}
+	return nil
+}