The s3 signature_version supports transparent passing of environment

[Jint-Tian]

Enhanced S3 Configuration Support

This update enhances the S3 storage configuration in the internal/server/server.go and internal/types/app/config.go files by introducing support for the S3SignatureVersion parameter. The changes include:

• Added S3SignatureVersion to the initOSS function in internal/server/server.go to pass the signature version configuration to the OSS setup.
• Extended the Config struct in internal/types/app/config.go with a new field S3SignatureVersion string, defaulting to "v4", allowing flexible specification of the S3 signature version.

These modifications enable better customization of S3 storage operations, providing support for different signature versions to enhance compatibility and flexibility.