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>

src/Modules/IdentityAccess/ManageIdentityAndRoles/Domain/IdentityState.cs

@@ -31,11 +31,8 @@ public sealed record IdentityState
     // Factory methods
     public static IdentityState CreateUndefined() => new(Undefined);
     public static IdentityState CreateActive() => new(Active);
-    public static IdentityState RequireMfaSetup() => new(RequiresMfaSetup);
-    public static IdentityState MfaSetupComplete() => new(MfaConfigured);
-    public static IdentityState SuspendMfa() => new(MfaSuspended);
-    public static IdentityState Deactivate() => new(Inactive);
-    public static IdentityState Revoke() => new(Revoked);
+    public static IdentityState CreateInactive() => new(Inactive);
+    public static IdentityState CreateRevoked() => new(Revoked);
     public static IdentityState Parse(string value) => new(value);
 
     // State transitions (immutable - return new state)