Allow all hosts in Vite server and preview config

Fixes: "Blocked request. This host is not allowed" error
- Add allowedHosts: 'all' to server config
- Add preview config with allowedHosts: 'all'

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: parthmodi152

frontend/vite.config.ts

@@ -33,6 +33,7 @@ export default defineConfig({
   server: {
     host: true,
     port: 3000,
+    allowedHosts: 'all',
     proxy: {
       '/api': {
         target: 'http://backend:8080',
@@ -42,4 +43,9 @@ export default defineConfig({
       },
     },
   },
+  preview: {
+    host: true,
+    port: 3000,
+    allowedHosts: 'all',
+  },
 });