Adds transactional outbox and email verification

Implements outbox pattern for reliable message delivery
Adds email verification flow with Postmark integration
Enhances account registration with secure token generation

Introduces background processing for asynchronous email sending
Implements database-level notification mechanism for message processing

TestPostgresLISTEN/Program.cs

@@ -4,7 +4,7 @@ class Program
 {
     static async Task Main(string[] args)
     {
-        var connectionString = "Host=192.168.1.57;Database=ptdb01;Username=postgres;Password=3911";
+        var connectionString = "Host=192.168.1.63;Database=ptmain;Username=postgres;Password=3911";
 
         try
         {
@@ -22,7 +22,7 @@ class Program
                 Console.WriteLine("------------------------");
             };
 
-            await using (var cmd = new NpgsqlCommand("LISTEN config_changes;", conn))
+            await using (var cmd = new NpgsqlCommand("LISTEN outbox_messages;", conn))
             {
                 await cmd.ExecuteNonQueryAsync();
             }

TestPostgresLISTEN/TestPostgresql.csproj

@@ -5,9 +5,8 @@
     <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
-
-  <ItemGroup>
-    <ProjectReference Include="..\Core\Core.csproj" />
-  </ItemGroup>
-
+	<ItemGroup>
+		
+		<PackageReference Include="npgsql" Version="9.0.2" />
+	</ItemGroup>
 </Project>