fix: 移除initTicketData中自动创建dev管理员账号

initTicketData()在安装前创建dev管理员账号，
导致checkAdminExists()返回true，安装向导无法提交。
改为在dev用户不存在时跳过工单初始化。

backend/internal/database/database.go

@@ -19,7 +19,6 @@ import (
 
 	"github.com/glebarez/sqlite"
 	"github.com/go-redis/redis/v8"
-	"golang.org/x/crypto/bcrypt"
 	"gorm.io/driver/mysql"
 	"gorm.io/gorm"
 	"gorm.io/gorm/logger"
@@ -730,20 +729,10 @@ func initTicketData() {
 	if ticketCount == 0 {
 		log.Println("Initializing ticket data...")
 
-		// 确保开发者用户存在
 		var devUser model.User
 		if err := DB.Where("username = ?", "dev").First(&devUser).Error; err != nil {
-			log.Println("Creating dev user for tickets...")
-			devEmail := "dev@example.com"
-			hashedPassword, _ := bcrypt.GenerateFromPassword([]byte("123456"), bcrypt.DefaultCost)
-			devUser = model.User{
-				Username: "dev",
-				Email:    &devEmail,
-				Password: string(hashedPassword),
-				Role:     "admin",
-				Status:   "active",
-			}
-			DB.Create(&devUser)
+			log.Println("No dev user found, skipping ticket initialization")
+			return
 		}
 
 		// 创建示例工单