refactor: 모델에 JSON 태그 추가 및 gorm.Model 인라인 확장

camelCase JSON 필드명으로 통일, PasswordHash json:"-" 처리

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/download/model.go

@@ -1,11 +1,18 @@
 package download
 
-import "gorm.io/gorm"
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
 
 type Info struct {
-	gorm.Model
-	URL      string `gorm:"not null"`
-	Version  string `gorm:"not null"`
-	FileName string `gorm:"not null"`
-	FileSize string `gorm:"not null"`
+	ID        uint           `json:"id"       gorm:"primaryKey"`
+	CreatedAt time.Time      `json:"createdAt"`
+	UpdatedAt time.Time      `json:"updatedAt"`
+	DeletedAt gorm.DeletedAt `json:"-"        gorm:"index"`
+	URL       string         `json:"url"      gorm:"not null"`
+	Version   string         `json:"version"  gorm:"not null"`
+	FileName  string         `json:"fileName" gorm:"not null"`
+	FileSize  string         `json:"fileSize" gorm:"not null"`
 }