Add route code splitting and Vite vendor chunk splitting

frontend/vite.config.ts

@@ -35,4 +35,41 @@ export default defineConfig({
       },
     },
   },
+  build: {
+    rollupOptions: {
+      output: {
+        manualChunks(id: string) {
+          if (id.includes("/node_modules/")) {
+            if (
+              id.includes("/node_modules/react/") ||
+              id.includes("/node_modules/react-dom/") ||
+              id.includes("/node_modules/react-router-dom/")
+            ) {
+              return "react-vendor";
+            }
+
+            if (
+              id.includes("/node_modules/@fluentui/") ||
+              id.includes("/node_modules/@griffel/") ||
+              id.includes("/node_modules/@radix-ui/")
+            ) {
+              return "ui-vendor";
+            }
+
+            if (id.includes("/node_modules/recharts/")) {
+              return "chart-vendor";
+            }
+
+            if (
+              id.includes("/node_modules/d3-") ||
+              id.includes("/node_modules/topojson-client/") ||
+              id.includes("/node_modules/world-atlas/")
+            ) {
+              return "geo-vendor";
+            }
+          }
+        },
+      },
+    },
+  },
 });