fix: encode filename when using url prefix for resources

[mudkipme]

Fixes #2828

[boojack]

Maybe we can decode it in https://github.com/usememos/memos/blob/main/api/v1/resource.go#L346

[mudkipme]

Maybe we can decode it in https://github.com/usememos/memos/blob/main/api/v1/resource.go#L346

Since replacePathTemplate is used by both local storage and S3, encoding filename here will result in percent-encoded filename in local assets folder, which is an unexpected behavior. I also wonder whether S3 SDK or object storage services will double-encoding the '%' character if pass a url-encoded object key.

[boojack]

LGTM