refactor(server): folder structure (#5573)

packages/backend/server/src/app.controller.ts

@@ -1,13 +1,16 @@
 import { Controller, Get } from '@nestjs/common';
 
+import { Config } from './fundamentals/config';
+
 @Controller('/')
 export class AppController {
+  constructor(private readonly config: Config) {}
+
   @Get()
   info() {
-    const version = AFFiNE.version;
     return {
-      compatibility: version,
-      message: `AFFiNE ${version} Server`,
+      compatibility: this.config.version,
+      message: `AFFiNE ${this.config.version} Server`,
     };
   }
 }