feat: Implement PolyWeather web map API backend and integrate new frontend dashboard components for city weather details.

frontend/lib/dashboard-client.ts

@@ -164,12 +164,19 @@ export const dashboardClient = {
 
   async getCityMarketScan(
     cityName: string,
-    options?: { force?: boolean; marketSlug?: string | null },
+    options?: {
+      force?: boolean;
+      marketSlug?: string | null;
+      targetDate?: string | null;
+    },
   ) {
     const force = options?.force ?? false;
     const marketSlug = options?.marketSlug || null;
+    const targetDate = options?.targetDate || null;
     if (!force) {
-      const requestKey = `${cityName}::cached::${marketSlug || "-"}`;
+      const requestKey = `${cityName}::cached::${marketSlug || "-"}::${
+        targetDate || "-"
+      }`;
       const existing = pendingMarketScanRequests.get(requestKey);
       if (existing) {
         return existing;
@@ -181,6 +188,9 @@ export const dashboardClient = {
       if (marketSlug) {
         params.set("market_slug", marketSlug);
       }
+      if (targetDate) {
+        params.set("target_date", targetDate);
+      }
 
       const request = fetchJson<{ market_scan?: MarketScan }>(
         `/api/city/${normalizeCityName(cityName)}/detail?${params.toString()}`,
@@ -201,6 +211,9 @@ export const dashboardClient = {
     if (marketSlug) {
       params.set("market_slug", marketSlug);
     }
+    if (targetDate) {
+      params.set("target_date", targetDate);
+    }
 
     return fetchJson<{ market_scan?: MarketScan }>(
       `/api/city/${normalizeCityName(cityName)}/detail?${params.toString()}`,