fix: marketplace asset paths and add vite.config.ts

- Fix dist/index.html: absolute /assets/ → relative assets/ paths
- Create vite.config.ts with base: '/marketplace/' for future builds
- Deploy mock data and vite.svg to server root for current build compat

apps/marketplace-web/vite.config.ts

@@ -0,0 +1,5 @@
+import { defineConfig } from 'vite'
+
+export default defineConfig({
+  base: '/marketplace/',
+})