feat(admin/problemset): add new problem creation pages

src/app/(app)/dashboard/@admin/problemset/new/description/page.tsx

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+import NewProblemDescriptionForm from "@/components/features/dashboard/admin/problemset/new/components/description-form";
+
+export default function NewProblemDescriptionPage() {
+  return <NewProblemDescriptionForm />;
+}

src/app/(app)/dashboard/@admin/problemset/new/metadata/page.tsx

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+import NewProblemMetadataForm from "@/components/features/dashboard/admin/problemset/new/components/metadata-form";
+
+export default function NewProblemMetadataPage() {
+  return <NewProblemMetadataForm />;
+}

src/app/(app)/dashboard/@admin/problemset/new/page.tsx

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+import { redirect } from "next/navigation";
+
+export default function NewProblemPage() {
+  redirect("/dashboard/problemset/new/metadata");
+}

src/app/(app)/dashboard/@admin/problemset/new/solution/page.tsx

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+import NewProblemSolutionForm from "@/components/features/dashboard/admin/problemset/new/components/solution-form";
+
+export default function NewProblemSolutionPage() {
+  return <NewProblemSolutionForm />;
+}