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.

prisma/seed.mjs

@@ -0,0 +1,74 @@
+import { PrismaClient } from "@prisma/client";
+
+const db = new PrismaClient();
+
+const grades = [
+  {
+    name: "Eclaireur",
+    price: 9,
+    description:
+      "Acces prioritaire, prefix colore, particules discretes et slots reserves.",
+  },
+  {
+    name: "Gladiateur",
+    price: 19,
+    description:
+      "Kit cosmetique PvP, tags exclusifs, bonus d'events et loot personnalise.",
+  },
+  {
+    name: "Titan",
+    price: 39,
+    description:
+      "Rang ultime, aura lumineuse, salons prives et avantages boutique VIP.",
+  },
+];
+
+const events = [
+  {
+    title: "UHC Arena - Duel Night",
+    description:
+      "Tournoi 1v1 avec bracket rapide. Score bonus pour les eliminations propres.",
+    eventDate: new Date("2026-05-18T19:00:00Z"),
+  },
+  {
+    title: "Rush 2v2 - Full PvP",
+    description:
+      "Arches, potions, clutchs. Inscription par equipe sur Discord.",
+    eventDate: new Date("2026-05-25T19:00:00Z"),
+  },
+  {
+    title: "UHC Royale",
+    description:
+      "Format 50 joueurs, shrink progressif, recompenses exclusives.",
+    eventDate: new Date("2026-06-01T19:00:00Z"),
+  },
+];
+
+const main = async () => {
+  for (const grade of grades) {
+    const existing = await db.grade.findFirst({
+      where: { name: grade.name },
+    });
+    if (!existing) {
+      await db.grade.create({ data: grade });
+    }
+  }
+
+  for (const event of events) {
+    const existing = await db.event.findFirst({
+      where: { title: event.title },
+    });
+    if (!existing) {
+      await db.event.create({ data: event });
+    }
+  }
+};
+
+main()
+  .catch((error) => {
+    console.error(error);
+    process.exit(1);
+  })
+  .finally(async () => {
+    await db.$disconnect();
+  });