Remove unused private fields in SiteConfig.cs

[poppastring]

The file DasBlog.Services\ConfigFile\SiteConfig.cs contains unused private fields (_cdnFrom and _cdnTo). These fields are never referenced and can be safely removed to clean up the code and resolve CS0169 warnings. Only the public properties CdnFrom and CdnTo are used.

Suggested fix:

• Remove the private fields _cdnFrom and _cdnTo from the SiteConfig class.

This will improve code clarity and eliminate unnecessary compiler warnings.