Switch to SmartRes Result/Error, upgrade to .NET 10

Migrate codebase to use SmartRes Result<T, Error> (and Unit) across services and interfaces, replacing previous Result usage and updating many method signatures and implementations. Add ResultExtensions to convert SmartRes results to ASP.NET ActionResult and refactor AuthController to use functional Bind/Tap chains for registration/login flows. Upgrade projects to .NET 10 and bump related NuGet packages; add libs/SmartRes.dll and project references. Simplify DbContext registration to use Npgsql only with retry policies and enable detailed logging. Update Swagger/launch settings and other minor fixes (AutoMapper registration change, whitespace/exception handling, and removal of the Govor.ConsoleClient files).

Govor.Application/Authentication/AuthService.cs

@@ -6,6 +6,7 @@ using Govor.Domain.Common;
 using Govor.Domain.Models;
 using Govor.Domain.Models.Users;
 using Microsoft.EntityFrameworkCore;
+using SmartRes;
 
 namespace Govor.Application.Authentication;
 
@@ -28,18 +29,18 @@ public class AuthService : IAccountService
         _usernameValidator = usernameValidator;
     }
     
-    public async Task<Result<User>> RegistrationAsync(string name, string password, Invitation invitation)
+    public async Task<Result<User, Error>> RegistrationAsync(string name, string password, Invitation invitation)
     {
       
         var validationResult = _usernameValidator.Validate(name);
         if (validationResult.IsFailure)
         {
-            return Result<User>.Failure(validationResult.Error);
+            return Result.Failure<User>(validationResult.Error);
         }
         
         if (await _userNameExistValidator.IsUsernameExistsAsync(name))
         {
-            return Result<User>.Failure(new Error(
+            return Result.Failure<User>(Error.Conflict(
                  nameof(UserAlreadyExistException), 
                 $"User with username '{name}' already exists."));
         }
@@ -63,12 +64,14 @@ public class AuthService : IAccountService
         
         await SetRoleAsync(user, invitation);
         
+        // TODO: inv.participantCount -= 1; db.save();
+        
         await _context.SaveChangesAsync();
         
         return user; // Success 
     }
 
-    public async Task<Result<User>> LoginAsync(string name, string password)
+    public async Task<Result<User, Error>> LoginAsync(string name, string password)
     {
         var user = await _context.Users
             .AsNoTracking()
@@ -76,14 +79,14 @@ public class AuthService : IAccountService
         
         if (user is null)
         {
-            return Result<User>.Failure(new Error(
+            return Result.Failure<User>(Error.NotFound(
                 nameof(UserNotRegisteredException), 
                 $"User '{name}' is not registered."));
         }
         
         if (!_passwordHasher.Verify(password, user.PasswordHash))
         {
-            return Result<User>.Failure(new Error(
+            return Result.Failure<User>(Error.Failure(
                 nameof(InvalidOperationException), 
                 "The password provided is incorrect."));
         }