Auth integration

Data/AuthService.cs

@@ -15,8 +15,26 @@ public class AuthService(IDbContextFactory<TimetrackerDbContext> factory)
         return VerifyPassword(password, user.PasswordHash, user.PasswordSalt) ? user : null;
     }
 
-    public async Task<(User? User, string? Error)> RegisterAsync(string username, string password)
+    public async Task<List<User>> GetAllUsersAsync()
     {
+        await using var db = await factory.CreateDbContextAsync();
+        return await db.Users
+            .OrderBy(u => u.Username)
+            .ToListAsync();
+    }
+
+    public async Task DeleteUserAsync(int userId)
+    {
+        await using var db = await factory.CreateDbContextAsync();
+        var user = await db.Users.FindAsync(userId);
+        if (user != null)
+        {
+            db.Users.Remove(user);
+            await db.SaveChangesAsync();
+        }
+    }
+
+    public async Task<(User? User, string? Error)> RegisterAsync(string username, string password)    {
         if (string.IsNullOrWhiteSpace(username) || username.Length < 3)
             return (null, "Benutzername muss mindestens 3 Zeichen lang sein.");
         if (string.IsNullOrWhiteSpace(password) || password.Length < 6)