feat: implement ScanTerminalDashboard component and associated CSS module for PolyWeather map interface

frontend/app/api/scan/terminal/ai-city/route.ts

@@ -0,0 +1,77 @@
+import { NextRequest, NextResponse } from "next/server";
+import {
+  applyAuthResponseCookies,
+  buildBackendRequestHeaders,
+} from "@/lib/backend-auth";
+
+const API_BASE = process.env.POLYWEATHER_API_BASE_URL;
+const SCAN_AI_PROXY_TIMEOUT_MS = Math.max(
+  35_000,
+  Number(process.env.POLYWEATHER_SCAN_AI_PROXY_TIMEOUT_MS || "45000") || 45_000,
+);
+
+export const dynamic = "force-dynamic";
+export const maxDuration = 60;
+
+export async function POST(req: NextRequest) {
+  if (!API_BASE) {
+    return NextResponse.json(
+      { error: "POLYWEATHER_API_BASE_URL is not configured" },
+      { status: 500 },
+    );
+  }
+
+  let body: unknown = {};
+  try {
+    body = await req.json();
+  } catch {
+    body = {};
+  }
+
+  let auth: Awaited<ReturnType<typeof buildBackendRequestHeaders>> | null = null;
+  const controller = new AbortController();
+  const timeoutId = setTimeout(() => controller.abort(), SCAN_AI_PROXY_TIMEOUT_MS);
+
+  try {
+    auth = await buildBackendRequestHeaders(req);
+    const headers = new Headers(auth.headers);
+    headers.set("Content-Type", "application/json");
+    headers.set("Accept", "application/json");
+    const res = await fetch(`${API_BASE}/api/scan/terminal/ai-city`, {
+      method: "POST",
+      headers,
+      cache: "no-store",
+      signal: controller.signal,
+      body: JSON.stringify(body || {}),
+    });
+    if (!res.ok) {
+      const raw = await res.text();
+      const response = NextResponse.json(
+        { error: `Backend returned ${res.status}`, detail: raw.slice(0, 300) },
+        { status: res.status === 402 || res.status === 403 ? res.status : 502 },
+      );
+      return applyAuthResponseCookies(response, auth.response);
+    }
+    const data = await res.json();
+    const response = NextResponse.json(data, {
+      headers: {
+        "Cache-Control": "no-store",
+      },
+    });
+    return applyAuthResponseCookies(response, auth.response);
+  } catch (error) {
+    const timedOut = controller.signal.aborted;
+    const response = NextResponse.json(
+      {
+        error: timedOut
+          ? "City AI request timed out"
+          : "Failed to fetch city AI data",
+        detail: String(error),
+      },
+      { status: timedOut ? 504 : 500 },
+    );
+    return auth ? applyAuthResponseCookies(response, auth.response) : response;
+  } finally {
+    clearTimeout(timeoutId);
+  }
+}