Remove explicit package versions, rely on Directory.Packages.props

The explicitly added versions were conflicting with the centralized version
definitions in Directory.Packages.props. Removed all explicit versions from:
- web/web.csproj
- Jobs/cv-cleanup-job/cv-cleanup-job.csproj
- Jobs/cv-search-job/cv-search-job.csproj

NuGet will now resolve versions from Directory.Packages.props which has the
canonical version definitions for the entire solution.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Jobs/cv-cleanup-job/cv-cleanup-job.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Hosting" Version="10.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Hosting" />
   </ItemGroup>
 
   <ItemGroup>

Jobs/cv-search-job/cv-search-job.csproj

@@ -10,9 +10,9 @@
 
   <ItemGroup>
     <!-- MailKit removed — email sending delegated to email-api service -->
-    <PackageReference Include="Microsoft.Extensions.Hosting" Version="10.0.0" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="10.0.0" />
-    <PackageReference Include="Refit.HttpClientFactory" Version="7.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Hosting" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" />
+    <PackageReference Include="Refit.HttpClientFactory" />
   </ItemGroup>
 
   <ItemGroup>

web/web.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.21.0" />
-    <PackageReference Include="Yarp.ReverseProxy" Version="2.2.0" />
+    <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" />
+    <PackageReference Include="Yarp.ReverseProxy" />
   </ItemGroup>
 </Project>