feat: Add entitlement middleware, root layout, and PWA assets for the frontend.

frontend/app/layout.tsx

@@ -7,6 +7,16 @@ export const metadata: Metadata = {
   title: "PolyWeather | Weather Intelligence",
   description:
     "PolyWeather pro dashboard with global weather risk map and city analytics.",
+  manifest: "/site.webmanifest",
+  icons: {
+    icon: [
+      { url: "/favicon.ico", type: "image/x-icon" },
+      { url: "/favicon-32x32.png", sizes: "32x32", type: "image/png" },
+      { url: "/favicon-16x16.png", sizes: "16x16", type: "image/png" },
+    ],
+    apple: [{ url: "/apple-touch-icon.png", sizes: "180x180", type: "image/png" }],
+    shortcut: ["/favicon.ico"],
+  },
 };
 
 export default function RootLayout({

frontend/middleware.ts

@@ -6,6 +6,10 @@ function isStaticAsset(pathname: string) {
   return (
     pathname.startsWith("/_next/") ||
     pathname.startsWith("/favicon") ||
+    pathname === "/apple-touch-icon.png" ||
+    pathname === "/manifest.webmanifest" ||
+    pathname === "/site.webmanifest" ||
+    pathname.startsWith("/android-chrome-") ||
     pathname.startsWith("/robots.txt") ||
     pathname.startsWith("/sitemap.xml") ||
     pathname.startsWith("/icons/") ||

frontend/public/manifest.webmanifest

@@ -0,0 +1 @@
+{"background_color":"#ffffff","display":"standalone","icons":[{"sizes":"192x192","src":"/android-chrome-192x192.png","type":"image/png"},{"sizes":"512x512","src":"/android-chrome-512x512.png","type":"image/png"}],"name":"","short_name":"","theme_color":"#ffffff"}

frontend/public/site.webmanifest

@@ -0,0 +1 @@
+{"background_color":"#ffffff","display":"standalone","icons":[{"sizes":"192x192","src":"/android-chrome-192x192.png","type":"image/png"},{"sizes":"512x512","src":"/android-chrome-512x512.png","type":"image/png"}],"name":"","short_name":"","theme_color":"#ffffff"}