refactor(server): rename AppModule to RootModule

packages/backend/src/RootModule.ts

@@ -0,0 +1,13 @@
+import { Module } from '@nestjs/common';
+import { ServerModule } from '@/server/ServerModule.js';
+import { GlobalModule } from '@/GlobalModule.js';
+import { QueueProcessorModule } from '@/queue/QueueProcessorModule.js';
+
+@Module({
+	imports: [
+		GlobalModule,
+		ServerModule,
+		QueueProcessorModule,
+	],
+})
+export class RootModule {}