Add new page module and services; refactor existing entities

- Introduced a new page module with associated services.
- Refactored TypeORM entities in user and workspace modules.

server/src/core/page/page.module.ts

@@ -0,0 +1,13 @@
+import { Module } from '@nestjs/common';
+import { PageService } from './page.service';
+import { PageController } from './page.controller';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { Page } from './entities/page.entity';
+import { PageRepository } from './repositories/page.repository';
+
+@Module({
+  imports: [TypeOrmModule.forFeature([Page])],
+  controllers: [PageController],
+  providers: [PageService, PageRepository],
+})
+export class PageModule {}