feat: Implement the PolyWeather dashboard including frontend components, data collection, analysis, and API endpoints.

frontend/app/api/city/[name]/detail/route.ts

@@ -0,0 +1,47 @@
+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 forceRefresh = req.nextUrl.searchParams.get("force_refresh") ?? "false";
+  const marketSlug = req.nextUrl.searchParams.get("market_slug");
+  const searchParams = new URLSearchParams({
+    force_refresh: forceRefresh,
+  });
+  if (marketSlug) {
+    searchParams.set("market_slug", marketSlug);
+  }
+  const url = `${API_BASE}/api/city/${encodeURIComponent(name)}/detail?${searchParams.toString()}`;
+
+  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 city detail aggregate", detail: String(error) },
+      { status: 500 },
+    );
+  }
+}