feat: Add photo management features, duplicate detection, attempt limits, and admin deletion

- Add duplicate photo detection (file hash and URL checking)
- Add max attempts per photo with UI counter
- Simplify penalty system (auto-enable when points > 0)
- Prevent scores from going below 0
- Add admin photo deletion functionality
- Improve navigation with always-visible logout
- Prevent users from guessing their own photos

app/admin/page.tsx

@@ -0,0 +1,43 @@
+import { auth } from "@/lib/auth"
+import { redirect } from "next/navigation"
+import { prisma } from "@/lib/prisma"
+import AdminUserList from "@/components/AdminUserList"
+import CreateUserForm from "@/components/CreateUserForm"
+
+export default async function AdminPage() {
+  const session = await auth()
+
+  if (!session || session.user.role !== "ADMIN") {
+    redirect("/")
+  }
+
+  const users = await prisma.user.findMany({
+    orderBy: { createdAt: "desc" },
+    select: {
+      id: true,
+      name: true,
+      email: true,
+      role: true,
+      points: true,
+      createdAt: true,
+    },
+  })
+
+  return (
+    <div className="max-w-7xl mx-auto px-4 py-8">
+      <h1 className="text-3xl font-bold text-gray-900 mb-8">Admin Panel</h1>
+
+      <div className="grid grid-cols-1 lg:grid-cols-2 gap-8">
+        <div className="bg-white rounded-lg shadow-md p-6">
+          <h2 className="text-xl font-semibold text-gray-900 mb-4">Create New User</h2>
+          <CreateUserForm />
+        </div>
+
+        <div className="bg-white rounded-lg shadow-md p-6">
+          <h2 className="text-xl font-semibold text-gray-900 mb-4">All Users</h2>
+          <AdminUserList users={users} />
+        </div>
+      </div>
+    </div>
+  )
+}