feat: initialize default root user

backend/internal/initdb/user.go

@@ -0,0 +1,36 @@
+package initdb
+
+import (
+	"golang.org/x/crypto/bcrypt"
+	"gorm.io/gorm"
+	"senlinai-agent/backend/internal/models"
+)
+
+const (
+	rootUsername = "root"
+	rootPassword = "123456"
+	rootRole     = "root"
+)
+
+// InitUser creates the default root account when the user table is empty.
+func InitUser(database *gorm.DB) error {
+	var count int64
+	if err := database.Model(&models.SenlinAgentUser{}).Count(&count).Error; err != nil {
+		return err
+	}
+	if count > 0 {
+		return nil
+	}
+
+	passwordHash, err := bcrypt.GenerateFromPassword([]byte(rootPassword), bcrypt.DefaultCost)
+	if err != nil {
+		return err
+	}
+
+	return database.Create(&models.SenlinAgentUser{
+		Email:        rootUsername,
+		DisplayName:  rootUsername,
+		PasswordHash: string(passwordHash),
+		Role:         rootRole,
+	}).Error
+}