feat: add Flutter web build support

apps/user_app/web/manifest.json

@@ -0,0 +1,17 @@
+{
+  "name": "和气瓶安",
+  "short_name": "和气瓶安",
+  "start_url": ".",
+  "display": "standalone",
+  "background_color": "#ffffff",
+  "theme_color": "#00695c",
+  "description": "和气瓶安用户端 Web 应用。",
+  "icons": [
+    {
+      "src": "icons/app-icon.svg",
+      "sizes": "any",
+      "type": "image/svg+xml",
+      "purpose": "any maskable"
+    }
+  ]
+}