feat: add React UI and AI page sharing tools

Move HTTP page rendering to the React app, fix multi-tool-call message handling, add API docs lookup, web page lookup, and Markdown preview page sharing.

web/vite.config.ts

@@ -0,0 +1,17 @@
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+import tailwindcss from "@tailwindcss/vite";
+
+// https://vite.dev/config/
+export default defineConfig({
+  plugins: [react(), tailwindcss()],
+  build: {
+    outDir: "dist",
+    emptyOutDir: true,
+  },
+  server: {
+    proxy: {
+      "/v1": "http://127.0.0.1:9003",
+    },
+  },
+});