refactor: use dtos in controllers

backend/internal/model/app_config.go

@@ -1,11 +1,11 @@
 package model
 
 type AppConfigVariable struct {
-	Key        string `gorm:"primaryKey;not null" json:"key"`
-	Type       string `json:"type"`
-	IsPublic   bool   `json:"-"`
-	IsInternal bool   `json:"-"`
-	Value      string `json:"value"`
+	Key        string `gorm:"primaryKey;not null"`
+	Type       string
+	IsPublic   bool
+	IsInternal bool
+	Value      string
 }
 
 type AppConfig struct {
@@ -14,8 +14,3 @@ type AppConfig struct {
 	LogoImageType       AppConfigVariable
 	SessionDuration     AppConfigVariable
 }
-
-type AppConfigUpdateDto struct {
-	AppName         string `json:"appName" binding:"required"`
-	SessionDuration string `json:"sessionDuration" binding:"required"`
-}