Remove unused private fields from SiteConfig.cs

[Copilot]

The SiteConfig class contained unused private fields _cdnFrom and _cdnTo that were never referenced, causing CS0169 compiler warnings.

Changes

• Removed private string _cdnFrom; and private string _cdnTo; declarations
• Public auto-properties CdnFrom and CdnTo remain unchanged and functional

The private fields were declared but never used anywhere in the codebase—the public properties handle all CDN configuration throughout the application (FileSystemBinaryManager, admin UI, configuration serialization).

Original prompt

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This section details on the original issue you should resolve

<issue_title>Remove unused private fields in SiteConfig.cs</issue_title>
<issue_description>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.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remove unused private fields in SiteConfig.cs #733

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