Standardize SurClaw ports away from defaults

- Change the API default listen port from 3000 to 3100 and include the Docker frontend origin in default CORS.

- Point Vite's default API proxy, Docker API container port, and Nginx upstream to 3100.

- Keep Docker host ports on 4002 for web, 3002 for API, and 5433 for PostgreSQL.

- Update environment examples and documentation to remove stale localhost:3000 guidance.

server/src/main.ts

@@ -12,12 +12,12 @@ import { SpeechService } from './speech/speech.service.js';
 
 const bootstrap = async () => {
   const app = await NestFactory.create(AppModule);
-  const port = Number(process.env.API_PORT ?? 3000);
+  const port = Number(process.env.API_PORT ?? 3100);
 
   app.setGlobalPrefix('api');
   app.useGlobalFilters(new ApiExceptionFilter());
   app.enableCors({
-    origin: process.env.CORS_ORIGIN?.split(',') ?? ['http://localhost:3001'],
+    origin: process.env.CORS_ORIGIN?.split(',') ?? ['http://localhost:3001', 'http://localhost:4002'],
     credentials: true,
   });
   app.use(cookieParser());