feat(frontend): wire Vite app to FastAPI parser with NDJSON streaming + Upload page

vite.config.ts

@@ -0,0 +1,16 @@
+import path from "node:path";
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+
+export default defineConfig({
+  plugins: [react()],
+  resolve: {
+    alias: {
+      "@": path.resolve(__dirname, "./src"),
+    },
+  },
+  server: {
+    port: 5173,
+    host: true,
+  },
+});