chore: update project files to use version variables for package references and adjust import order

- Replace hardcoded package versions with version variables in SufiChain.SufiBlazor and SufiChain.SufiBlazor.Demo.Localization project files.
- Change import order in Directory.Build.props to prioritize versions.props before common.props.

Directory.Build.props

@@ -1,5 +1,6 @@
 <Project>
-    <Import Project="common.props" />
+  <Import Project="versions.props" />
+  <Import Project="common.props" />
 
   <PropertyGroup>
     <Company>Sufi Chain Intelligent Solutions</Company>