fix: align backend APIs and upload flow

User.Infrastructure/Migrations/20260915000100_ManagementReceipts.cs

@@ -0,0 +1,19 @@
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+namespace IdentityService.Infrastructure.Migrations;
+[DbContext(typeof(UserDbContext))]
+[Migration("20260915000100_ManagementReceipts")]
+public class ManagementReceipts : Migration
+{
+    protected override void Up(MigrationBuilder m) => m.Sql("""
+        CREATE TABLE IF NOT EXISTS management_receipts (
+          Owner varchar(64) NOT NULL,
+          Id char(36) NOT NULL,
+          Payload longtext NOT NULL,
+          CreatedAt datetime(6) NOT NULL,
+          PRIMARY KEY (Owner, Id)
+        ) CHARACTER SET utf8mb4;
+        """);
+    // Receipts are retained on rollback: losing idempotency history can repeat a previously applied action.
+    protected override void Down(MigrationBuilder m) { }
+}