fix(examples): 修复engine demo部署后资源访问问题

Author: wumail

demo/bpmn-and-engine/vite.config.ts

@@ -6,6 +6,7 @@ import path from 'path';
 
 // https://vitejs.dev/config/
 export default defineConfig({
+  base: "/demo/dist/bpmn-and-engine/",
   plugins: [
     vue({
       template: {