IDE0065 ("using directives placement") is now fully suppressed in all build and IDE environments via .editorconfig and NoWarn in project files. Added HOW_TO_IGNORE_IDE0065.md for documentation. Refactored PhotoProvider.cs to use namespace-scoped usings and a primary constructor. Updated code analysis assemblies and project cache files to reflect these changes.
Refactored all C# test files to use explicit namespace declarations and moved all using directives inside the namespace block for consistency. Updated assembly info and cache files to reflect the new build. Adjusted MvcTestingAppManifest.json to use fully qualified assembly names. No functional changes; all updates are related to code style, organization, and project metadata.