Refactor code structure and dependencies

- Remove unused files and modules
- Update submodule URL for epess-database
- Update DATABASE_URL in compose.yaml
- Update CI workflow to fetch submodules during checkout and fix GITHUB_TOKEN issue
- Enable strict mode in tsconfig.json
- Add UsersService and UsersResolver in users module
- Remove AppService and AppController
- Update main.ts to remove unused imports and log statement
- Add PrismaModule and PrismaService
- Add PrismaContextMiddleware
- Update GraphQL module to use schema and PrismaService
- Update package.json dependencies and devDependencies

src/main.ts

@@ -1,11 +1,9 @@
 import { NestFactory } from '@nestjs/core';
 import { AppModule } from './app.module';
-import { Logger } from '@nestjs/common';
 
-// init log for bootstrap
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
+
   await app.listen(3000);
-  Logger.log(`Server running on http://localhost:3000`, 'Bootstrap');
 }
 bootstrap();