feat(leaderboard): add global rankings screen with solo/multi/all filters

app/api/leaderboard/route.ts

@@ -0,0 +1,40 @@
+import { NextResponse } from "next/server";
+import { prisma } from "../../../lib/prisma";
+
+export async function GET() {
+  const users = await prisma.user.findMany({
+    include: { games: true },
+  });
+
+  const rows = users
+    .map((u) => {
+      const all = u.games;
+      const solo = all.filter((g) => g.mode === "solo");
+      const multi = all.filter((g) => g.mode === "multi");
+      const wins = all.filter((g) => g.won);
+      const wonGames = all.filter((g) => g.won && g.clicks > 0);
+      const avgClicks = wonGames.length
+        ? Math.round(wonGames.reduce((s, g) => s + g.clicks, 0) / wonGames.length)
+        : null;
+      const bestTime = wins.length
+        ? Math.min(...wins.map((g) => g.timeSeconds))
+        : null;
+
+      return {
+        id: u.id,
+        name: u.name,
+        totalGames: all.length,
+        wins: wins.length,
+        soloGames: solo.length,
+        soloWins: solo.filter((g) => g.won).length,
+        multiGames: multi.length,
+        multiWins: multi.filter((g) => g.won).length,
+        avgClicks,
+        bestTime,
+      };
+    })
+    .filter((r) => r.totalGames > 0)
+    .sort((a, b) => b.wins - a.wins || b.totalGames - a.totalGames);
+
+  return NextResponse.json(rows);
+}