fix: ClubLoginNAme auf DB Ebene 50 Zeichen lang

src/Koogle.Infrastructure/Data/Configurations/ClubConfiguration.cs

@@ -17,7 +17,7 @@ public class ClubConfiguration : IEntityTypeConfiguration<Club>
             .IsRequired();
 
         builder.Property(x => x.LoginName)
-            .HasMaxLength(10)
+            .HasMaxLength(50)
             .IsRequired();
 
         // Enum als int (Default) – explizit ist oft schöner

src/Koogle.Infrastructure/Data/Migrations/20260107082529_IncreaseClubLoginNameLength.cs

@@ -0,0 +1,40 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Koogle.Infrastructure.Data.Migrations
+{
+    /// <inheritdoc />
+    public partial class IncreaseClubLoginNameLength : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<string>(
+                name: "LoginName",
+                schema: "app",
+                table: "Clubs",
+                type: "nvarchar(50)",
+                maxLength: 50,
+                nullable: false,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(10)",
+                oldMaxLength: 10);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<string>(
+                name: "LoginName",
+                schema: "app",
+                table: "Clubs",
+                type: "nvarchar(10)",
+                maxLength: 10,
+                nullable: false,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(50)",
+                oldMaxLength: 50);
+        }
+    }
+}

src/Koogle.Infrastructure/Data/Migrations/AppDbContextModelSnapshot.cs

@@ -176,8 +176,8 @@ namespace Koogle.Infrastructure.Data.Migrations
 
                     b.Property<string>("LoginName")
                         .IsRequired()
-                        .HasMaxLength(10)
-                        .HasColumnType("nvarchar(10)");
+                        .HasMaxLength(50)
+                        .HasColumnType("nvarchar(50)");
 
                     b.Property<DateTime?>("ModifiedAt")
                         .HasColumnType("datetime2");

src/Koogle.Web/Components/Pages/Account/ClubSetup.razor

@@ -72,6 +72,7 @@
                         Label="Login-Name"
                         Variant="Variant.Outlined"
                         Required="true"
+                        MaxLength="10"
                         HelperText="Eindeutiger Kurzname (z.B. meinclub)"
                         Style="text-transform: lowercase;"
                         Class="mb-3" />