Refactor proof manager

apps/proof-manager/src/config/http.config.ts

 import { registerAs } from '@nestjs/config';
 
 export const httpConfig = registerAs('http', () => ({
-  host: process.env.HOST,
-  port: Number(process.env.PORT),
+  host: process.env.HOST || '0.0.0.0',
+  port: Number(process.env.PORT) || 3000,
 }));