feat: Enhance texture upload functionality and API response format

- Introduced a new upload endpoint for direct texture file uploads, allowing users to upload textures with validation for size and format.
- Updated existing texture-related API responses to a standardized format, improving consistency across the application.
- Refactored texture service methods to handle file uploads and reuse existing texture URLs based on hash checks.
- Cleaned up Dockerfile and other files by removing unnecessary whitespace.

internal/service/upload_service.go

@@ -129,7 +129,7 @@ func GetUploadConfig(fileType FileType) *UploadConfig {
 				".gif":  true,
 				".webp": true,
 			},
-			MinSize: 1024,            // 1KB
+			MinSize: 512,             // 512B
 			MaxSize: 5 * 1024 * 1024, // 5MB
 			Expires: 15 * time.Minute,
 		}
@@ -138,7 +138,7 @@ func GetUploadConfig(fileType FileType) *UploadConfig {
 			AllowedExts: map[string]bool{
 				".png": true,
 			},
-			MinSize: 1024,             // 1KB
+			MinSize: 512,              // 512B
 			MaxSize: 10 * 1024 * 1024, // 10MB
 			Expires: 15 * time.Minute,
 		}