feat(infra): implement RefreshTokenRepository with Dapper and add GetByIdAsync to UsuarioRepository

src/api/SIGCM2.Infrastructure/Persistence/UsuarioRepository.cs

@@ -32,7 +32,32 @@ public sealed class UsuarioRepository : IUsuarioRepository
 
         if (row is null) return null;
 
-        return new Usuario(
+        return MapRow(row);
+    }
+
+    public async Task<Usuario?> GetByIdAsync(int id, CancellationToken ct = default)
+    {
+        const string sql = """
+            SELECT
+                Id, Username, PasswordHash,
+                Nombre, Apellido, Email,
+                Rol, PermisosJson, Activo
+            FROM dbo.Usuario
+            WHERE Id = @Id
+            """;
+
+        await using var connection = _connectionFactory.CreateConnection();
+        await connection.OpenAsync();
+
+        var row = await connection.QuerySingleOrDefaultAsync<UsuarioRow>(sql, new { Id = id });
+
+        if (row is null) return null;
+
+        return MapRow(row);
+    }
+
+    private static Usuario MapRow(UsuarioRow row)
+        => new(
             id: row.Id,
             username: row.Username,
             passwordHash: row.PasswordHash,
@@ -43,7 +68,6 @@ public sealed class UsuarioRepository : IUsuarioRepository
             permisosJson: row.PermisosJson,
             activo: row.Activo
         );
-    }
 
     // Flat DTO for Dapper mapping (avoids polluting domain entity with Dapper attributes)
     private sealed record UsuarioRow(