feat: 添加用户认证模块

- main.go: 初始化 User/Role 模型、UserRepository、AuthService 和 AuthHandler
- 添加 /auth/register、/auth/login、/auth/me 路由
- auth_handler.go: 新增 GetCurrentUser 接口获取当前用户信息
- .gitignore: 添加 .bitfun/ 目录忽略

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

server/cmd/api/main.go

@@ -9,6 +9,7 @@ import (
 	"time"
 	"x-agents/server/internal/config"
 	"x-agents/server/internal/handler"
+	"x-agents/server/internal/middleware"
 	"x-agents/server/internal/model"
 	"x-agents/server/internal/repository"
 	"x-agents/server/internal/service"
@@ -70,13 +71,14 @@ func main() {
 	}
 
 	// 3. 自动迁移表
-	db.AutoMigrate(&model.DatabaseInfo{}, &model.SubTableInfo{}, &model.ModelInfo{}, &model.KnowledgeBase{}, &model.KnowledgeDocument{})
+	db.AutoMigrate(&model.DatabaseInfo{}, &model.SubTableInfo{}, &model.ModelInfo{}, &model.KnowledgeBase{}, &model.KnowledgeDocument{}, &model.User{}, &model.Role{})
 
 	// 4. 初始化 Repository
 	dbRepo := repository.NewDatabaseRepository(db)
 	subTableRepo := repository.NewSubTableRepository(db)
 	modelRepo := repository.NewModelRepository(db)
 	knowledgeRepo := repository.NewKnowledgeRepository(db)
+	userRepo := repository.NewUserRepository(db)
 
 	// 5. 初始化 Service
 	dbService := service.NewDatabaseService(dbRepo, subTableRepo)
@@ -88,6 +90,7 @@ func main() {
 		log.Printf("Warning: Failed to initialize upload service: %v (files will not be available)", err)
 	}
 	knowledgeService := service.NewKnowledgeService(knowledgeRepo, modelRepo, uploadService, cfg.PythonServiceURL, cfg.AICoreServiceAddr, cfg.MarkdownLocalPath)
+	authService := service.NewAuthService(cfg.JWTSecret, userRepo)
 
 	// 6. 初始化 Handler
 	dbHandler := handler.NewDatabaseHandler(dbService)
@@ -96,6 +99,7 @@ func main() {
 	modelHandler := handler.NewModelHandler(modelService)
 	systemHandler := handler.NewSystemHandler()
 	knowledgeHandler := handler.NewKnowledgeHandler(knowledgeService)
+	authHandler := handler.NewAuthHandler(authService)
 	var uploadHandler *handler.UploadHandler
 	if uploadService != nil {
 		uploadHandler = handler.NewUploadHandler(uploadService, knowledgeRepo)
@@ -144,6 +148,20 @@ func main() {
 		c.Next()
 	})
 
+	// 认证模块（无需登录）
+	authGroup := r.Group("/auth")
+	{
+		authGroup.POST("/register", authHandler.Register)
+		authGroup.POST("/login", authHandler.Login)
+	}
+
+	// 需要登录的认证模块
+	authProtectedGroup := r.Group("/auth")
+	authProtectedGroup.Use(middleware.Auth(cfg.JWTSecret))
+	{
+		authProtectedGroup.GET("/me", authHandler.GetCurrentUser)
+	}
+
 	// 数据库管理模块
 	databaseGroup := r.Group("/database")
 	{