fix: disable MinVer when manual version is provided

MinVer was overriding the manual -p:Version parameter because it runs
during the build process in Release mode. Now MinVer will be skipped
when the Version property is set, allowing manual version specification
to work correctly.

This completes the fix for NuGet package versioning in CI/CD.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: phmatray

Directory.Build.props

@@ -12,7 +12,7 @@
     <Authors>Philippe Matray</Authors>
     <!-- MinVer Configuration for all projects -->
     <MinVerTagPrefix>v</MinVerTagPrefix>
-    <MinVerSkip Condition="'$(Configuration)' == 'Debug'">true</MinVerSkip>
+    <MinVerSkip Condition="'$(Configuration)' == 'Debug' or '$(Version)' != ''">true</MinVerSkip>
   </PropertyGroup>
 
   <!-- Code Analysis Settings -->