移除管理员数据库模型，改为通过配置管理管理员身份和认证逻辑，并更新相关逻辑和文档

internal/bootstrap/init.go

@@ -34,7 +34,6 @@ func InitDB() {
 		&model.FileBatch{},
 		&model.FileItem{},
 		&model.APIToken{},
-		&model.Admin{},
 	)
 	if err != nil {
 		log.Fatalf("Failed to migrate database: %v", err)
@@ -74,31 +73,28 @@ func ReloadStorage() error {
 }
 
 func initAdmin() {
-	var count int64
-	DB.Model(&model.Admin{}).Count(&count)
-	if count == 0 {
-		passwordHash := config.GlobalConfig.Security.AdminPasswordHash
-		if passwordHash == "" {
-			// 生成随机密码
-			password := generateRandomPassword(12)
-			hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
-			if err != nil {
-				log.Fatalf("Failed to generate password hash: %v", err)
-			}
-			passwordHash = string(hash)
-			fmt.Printf("**************************************************\n")
-			fmt.Printf("NO ADMIN PASSWORD CONFIGURED. GENERATED RANDOM PASSWORD:\n")
-			fmt.Printf("Password: %s\n", password)
-			fmt.Printf("Please save this password or configure admin_password_hash in config.yaml\n")
-			fmt.Printf("**************************************************\n")
+	passwordHash := config.GlobalConfig.Security.AdminPasswordHash
+	if passwordHash == "" {
+		// 生成随机密码
+		password := generateRandomPassword(12)
+		hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+		if err != nil {
+			log.Fatalf("Failed to generate password hash: %v", err)
 		}
+		passwordHash = string(hash)
+		fmt.Printf("**************************************************\n")
+		fmt.Printf("NO ADMIN PASSWORD CONFIGURED. GENERATED RANDOM PASSWORD:\n")
+		fmt.Printf("Password: %s\n", password)
+		fmt.Printf("Please save this password or configure admin_password_hash in config.yaml\n")
+		fmt.Printf("**************************************************\n")
 
-		admin := &model.Admin{
-			PasswordHash: passwordHash,
+		// 将生成的哈希保存回配置文件
+		config.GlobalConfig.Security.AdminPasswordHash = passwordHash
+		if err := config.SaveConfig(); err != nil {
+			fmt.Printf("Warning: Failed to save generated password hash to config: %v\n", err)
 		}
-		DB.Create(admin)
-		fmt.Println("Admin account initialized.")
 	}
+	fmt.Println("Admin authentication initialized via config.")
 }
 
 func generateRandomPassword(length int) string {