feat: 添加用户认证服务，包括用户注册、登录、刷新令牌功能，并支持Gitee和GitHub OAuth认证。

internal/service/gitee_oauth_service.go

@@ -42,18 +42,20 @@ type GiteeTokenResponse struct {
 
 // GiteeOAuthService handles Gitee OAuth operations
 type GiteeOAuthService struct {
-	userRepo    *repository.UserRepository
-	authService *AuthService
-	cfg         *config.Config
-	httpClient  *http.Client
+	userRepo      *repository.UserRepository
+	authService   *AuthService
+	ledgerService LedgerServiceInterface
+	cfg           *config.Config
+	httpClient    *http.Client
 }
 
 // NewGiteeOAuthService creates a new GiteeOAuthService instance
-func NewGiteeOAuthService(userRepo *repository.UserRepository, authService *AuthService, cfg *config.Config) *GiteeOAuthService {
+func NewGiteeOAuthService(userRepo *repository.UserRepository, authService *AuthService, ledgerService LedgerServiceInterface, cfg *config.Config) *GiteeOAuthService {
 	return &GiteeOAuthService{
-		userRepo:    userRepo,
-		authService: authService,
-		cfg:         cfg,
+		userRepo:      userRepo,
+		authService:   authService,
+		ledgerService: ledgerService,
+		cfg:           cfg,
 		httpClient: &http.Client{
 			Timeout: 60 * time.Second,
 			Transport: &http.Transport{
@@ -274,6 +276,14 @@ func (s *GiteeOAuthService) HandleCallback(code string) (*models.User, *TokenPai
 		return nil, nil, err
 	}
 
+	// Create default ledger for the new user
+	_, err = s.ledgerService.CreateLedger(newUser.ID, LedgerInput{
+		Name:      "日常账本",
+		Theme:     "pink",
+		IsDefault: true,
+		SortOrder: 0,
+	})
+
 	// Create OAuth account link
 	oauth := &models.OAuthAccount{
 		UserID:      newUser.ID,