Suppress IDE0065 globally; refactor PhotoProvider.cs

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.

Directory.Build.props

@@ -8,10 +8,14 @@
   <PropertyGroup>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <WarningsNotAsErrors>NU1902;NU1903</WarningsNotAsErrors>
+    <!-- Suppress IDE0065 globally for all projects -->
+    <NoWarn>$(NoWarn);IDE0065</NoWarn>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
     <AnalysisMode>AllEnabledByDefault</AnalysisMode>
+    <!-- Don't enforce code style rules as build errors in Debug -->
+    <EnforceCodeStyleInBuild>false</EnforceCodeStyleInBuild>
   </PropertyGroup>
 
   <ItemGroup>