chore: remove dead code and tune frontend chunks

Remove unused production symbols, starter assets, and stale browser tooling; reduce frontend chunk fragmentation.

apps/server/src/main.ts

@@ -1,5 +1,4 @@
 import { NestFactory } from '@nestjs/core';
-import { ValidationPipe } from '@nestjs/common';
 import { AppModule } from './app.module';
 import { runMigrationsOnStartup } from './migration-runner';