feat: Implement new Next.js frontend with an embedded Leaflet map dashboard, city markers, and Polymarket API integration.

frontend/app/api/polymarket/[name]/route.ts

@@ -0,0 +1,53 @@
+import { NextRequest, NextResponse } from "next/server";
+
+const API_BASE = process.env.POLYWEATHER_API_BASE_URL;
+
+export async function GET(
+  req: NextRequest,
+  context: { params: Promise<{ name: string }> },
+) {
+  if (!API_BASE) {
+    return NextResponse.json(
+      { error: "POLYWEATHER_API_BASE_URL is not configured" },
+      { status: 500 },
+    );
+  }
+
+  const { name } = await context.params;
+  const params = new URLSearchParams();
+  const forceRefresh = req.nextUrl.searchParams.get("force_refresh");
+  const targetDate = req.nextUrl.searchParams.get("target_date");
+
+  if (forceRefresh != null) {
+    params.set("force_refresh", forceRefresh);
+  }
+  if (targetDate) {
+    params.set("target_date", targetDate);
+  }
+
+  const qs = params.toString();
+  const url = `${API_BASE}/api/polymarket/${encodeURIComponent(name)}${qs ? `?${qs}` : ""}`;
+
+  try {
+    const res = await fetch(url, {
+      headers: { Accept: "application/json" },
+      cache: "no-store",
+    });
+
+    if (!res.ok) {
+      const raw = await res.text();
+      return NextResponse.json(
+        { error: `Backend returned ${res.status}`, detail: raw.slice(0, 300) },
+        { status: 502 },
+      );
+    }
+
+    const data = await res.json();
+    return NextResponse.json(data);
+  } catch (error) {
+    return NextResponse.json(
+      { error: "Failed to fetch polymarket snapshot", detail: String(error) },
+      { status: 500 },
+    );
+  }
+}