server : (web ui) Various improvements, now use vite as bundler (#10599)

* hide buttons in dropdown menu

* use npm as deps manager and vite as bundler

* fix build

* fix build (2)

* fix responsive on mobile

* fix more problems on mobile

* sync build

* (test) add CI step for verifying build

* fix ci

* force rebuild .hpp files

* cmake: clean up generated files pre build

examples/server/webui/vite.config.js

@@ -0,0 +1,36 @@
+
+import { viteSingleFile } from 'vite-plugin-singlefile';
+import path from 'path';
+import fs from 'fs';
+
+const GUIDE_FOR_FRONTEND = `
+<!--
+  This is a single file build of the frontend.
+  It is automatically generated by the build process.
+  Do not edit this file directly.
+  To make changes, refer to the "Web UI" section in the README.
+-->
+`.trim();
+
+export default {
+  plugins: [
+    viteSingleFile(),
+    (function llamaCppPlugin() {
+      let config;
+      return {
+        name: 'llamacpp:build',
+        apply: 'build',
+        async configResolved(_config) {
+          config = _config;
+        },
+        writeBundle() {
+          const outputIndexHtml = path.join(config.build.outDir, 'index.html');
+          const content = fs.readFileSync(outputIndexHtml, 'utf-8');
+
+          const targetOutputFile = path.join(config.build.outDir, '../../public/index.html');
+          fs.writeFileSync(targetOutputFile, GUIDE_FOR_FRONTEND + '\n' + content);
+        }
+      }
+    })(),
+  ],
+};