Add support for iOS app icons and PWA favicons

Updates `client/index.html` and `client/public/manifest.json` to include proper iOS icon links and specifies PNG format for favicons. Enhances the `/api/favicon` endpoint to generate PNG favicons using `sharp` for various sizes and includes the "go4" text for larger icons. Also adds `@types/compression` to `package.json` and `package-lock.json`.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ab9cd02a-d0b2-4288-9ceb-1964d0059648
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/8cc42625-c1f5-4e43-99bd-77f2c4dedee2/ab9cd02a-d0b2-4288-9ceb-1964d0059648/mbX83Mu

package-lock.json

@@ -43,6 +43,7 @@
         "@radix-ui/react-tooltip": "^1.2.0",
         "@tanstack/react-query": "^5.60.5",
         "@types/bcryptjs": "^2.4.6",
+        "@types/compression": "^1.8.1",
         "@types/memoizee": "^0.4.12",
         "@types/multer": "^2.0.0",
         "@types/node-fetch": "^2.6.13",
@@ -4326,6 +4327,16 @@
       "integrity": "sha512-hWtVTC2q7hc7xZ/RLbxapMvDMgUnDvKvMOpKal4DrMyfGBUfB1oKaZlIRr6mJL+If3bAP6sV/QneGzF6tJjZDg==",
       "license": "MIT"
     },
+    "node_modules/@types/compression": {
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/@types/compression/-/compression-1.8.1.tgz",
+      "integrity": "sha512-kCFuWS0ebDbmxs0AXYn6e2r2nrGAb5KwQhknjSPSPgJcGd8+HVSILlUyFhGqML2gk39HcG7D1ydW9/qpYkN00Q==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/express": "*",
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/connect": {
       "version": "3.4.38",
       "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.38.tgz",