feat: add authentication and user management features

- Implemented AuthButton component for Discord sign-in and sign-out functionality.
- Created CopyButton component for copying server IP addresses.
- Developed EventCard and GradeCard components for displaying events and grades.
- Added Footer and Navbar components for site navigation and information.
- Introduced PurchaseButton for handling grade purchases with Stripe integration.
- Created SectionHeader component for consistent section titles.
- Implemented session management with SessionProvider for NextAuth.
- Set up PostgreSQL database with Docker and Prisma for data management.
- Added admin guard functionality to restrict access to certain routes.
- Configured NextAuth with Discord provider for user authentication.
- Defined Prisma schema for user, admin, grade, event, and purchase models.
- Seeded database with initial grades and events data.
- Added SVG hero image for the landing page.
- Extended NextAuth types to include additional user properties.

app/api/purchases/route.ts

@@ -0,0 +1,38 @@
+import { getServerSession } from "next-auth";
+import { authOptions } from "@/lib/auth";
+import { db } from "@/lib/db";
+
+export const dynamic = "force-dynamic";
+
+export async function POST(request: Request) {
+  const session = await getServerSession(authOptions);
+  if (!session?.user?.id) {
+    return Response.json({ error: "Unauthorized" }, { status: 401 });
+  }
+
+  const body = await request.json();
+  const gradeId = body?.gradeId as string | undefined;
+  if (!gradeId) {
+    return Response.json({ error: "Grade id required" }, { status: 400 });
+  }
+
+  const grade = await db.grade.findUnique({ where: { id: gradeId } });
+  if (!grade) {
+    return Response.json({ error: "Grade not found" }, { status: 404 });
+  }
+
+  const purchase = await db.purchase.create({
+    data: {
+      userId: session.user.id,
+      gradeId: grade.id,
+      amount: grade.price,
+      status: "PENDING",
+    },
+  });
+
+  return Response.json({
+    id: purchase.id,
+    status: purchase.status,
+    message: "Mock purchase queued",
+  });
+}