feat(auth): upgrade casbin to v3 and enhance connection pool configurations

- Upgrade casbin from v2 to v3 across go.mod and pkg/auth/casbin.go
- Add slide captcha verification to registration flow (CheckVerified, ConsumeVerified)
- Add DB wrapper with connection pool statistics and health checks
- Add Redis connection pool optimizations with stats and health monitoring
- Add new config options: ConnMaxLifetime, HealthCheckInterval, EnableRetryOnError
- Optimize slow query threshold from 200ms to 100ms
- Add ping with retry mechanism for database and Redis connections

internal/service/texture_service.go

@@ -330,10 +330,10 @@ func (s *textureService) UploadTexture(ctx context.Context, uploaderID int64, na
 		}
 
 		// 生成对象名称（路径）
-		// 格式: hash/{hash[:2]}/{hash[2:4]}/{hash}.png
-		// 使用哈希值作为路径，避免重复存储相同文件
+		// 格式: type/hash[:2]/hash
+		// 使用哈希值作为文件名，不带扩展名
 		textureTypeFolder := strings.ToLower(textureType)
-		objectName := fmt.Sprintf("%s/%s/%s/%s/%s%s", textureTypeFolder, hash[:2], hash[2:4], hash, hash, ext)
+		objectName := fmt.Sprintf("%s/%s", textureTypeFolder, hash)
 
 		// 上传文件
 		reader := bytes.NewReader(fileData)