feat(market): add Minha Intenções tab with panel, hook, and badge

- Introduced "Minhas Intenções" tab visible only to logged-in users.
- Integrated MyPurchaseIntentionsPanel and useMyPurchaseIntentions hook.
- Added tab badge showing count of pending intentions.
- Extended session API to include user’s main character for downstream features.

app/api/socket/route.ts

@@ -0,0 +1,16 @@
+/**
+ * API Route para Socket.io
+ * Next.js 15 não suporta servidor HTTP customizado diretamente
+ * Esta rota será usada para health check
+ * O Socket.io será inicializado via server.ts customizado
+ */
+
+import { NextResponse } from "next/server";
+
+export async function GET() {
+  return NextResponse.json({
+    status: "ok",
+    message: "Socket.io está ativo",
+  });
+}
+