feat: add error handling to player creation and update gitignore for agent

prisma/migrations/20260121025323_sync_schema/migration.sql

@@ -0,0 +1,15 @@
+/*
+  Warnings:
+
+  - A unique constraint covering the columns `[email]` on the table `Group` will be added. If there are existing duplicate values, this will fail.
+
+*/
+-- AlterTable
+ALTER TABLE "Group" ADD COLUMN     "email" TEXT,
+ADD COLUMN     "password" TEXT;
+
+-- AlterTable
+ALTER TABLE "Player" ALTER COLUMN "number" DROP NOT NULL;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "Group_email_key" ON "Group"("email");