WIP: AEG-VS-01-04 Part 2 - DI setup + Endpoint refactoring (token budget constraint)

- Added IdentityAccessModule.cs with DI registration
- Added KArtSell.Modules.IdentityAccess.csproj with FastEndpoints deps
- Added project files for UnitTests & IntegrationTests
- Updated Program.cs to register IdentityAccessModule
- Updated Host.csproj to reference IdentityAccess module
- Fixed Directory.Packages.props with Moq + MS.Extensions.DependencyInjection

ISSUES (to fix next session):
- FastEndpoints Send/SendAsync/SendOkAsync method resolution incomplete
- Response record initialization requires field values
- Need to refactor endpoints to match ModelOperations pattern exactly

WORKING:
- Domain layer (IdentityState, RoleAssignmentState) ✅
- SQL repositories (Dapper) ✅
- Unit tests (RegisterIdentity, RequestMfaSetup handlers) ✅
- Integration test structure ready ✅

Next: Simplify endpoints using 'Endpoint<Req,Resp>' pattern from GetApprovalQueue sample

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

tests/KArtSell.IdentityAccess.IntegrationTests/KArtSell.IdentityAccess.IntegrationTests.csproj

@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+    <NoWarn>$(NoWarn);CA1001;CA1707;CA1711;CA1859;DAP005</NoWarn>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="../../src/KArtSell.BuildingBlocks/KArtSell.BuildingBlocks.csproj" />
+    <ProjectReference Include="../../src/Modules/IdentityAccess/KArtSell.Modules.IdentityAccess.csproj" />
+    <PackageReference Include="Dapper" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" />
+    <PackageReference Include="Npgsql" />
+    <PackageReference Include="xunit" />
+    <PackageReference Include="xunit.runner.visualstudio" PrivateAssets="all" />
+  </ItemGroup>
+</Project>