refactor(server): folder structure (#5573)

packages/backend/server/src/app.ts

@@ -2,16 +2,16 @@ import { DynamicModule, Module, Type } from '@nestjs/common';
 import { APP_INTERCEPTOR } from '@nestjs/core';
 
 import { AppController } from './app.controller';
-import { CacheInterceptor, CacheModule } from './cache';
-import { RedisModule } from './cache/redis';
-import { ConfigModule, SERVER_FLAVOR } from './config';
-import { EventModule } from './event';
-import { MetricsModule } from './metrics';
+import { CacheInterceptor, CacheModule } from './fundamentals/cache';
+import { ConfigModule } from './fundamentals/config';
+import { EventModule } from './fundamentals/event';
+import { MailModule } from './fundamentals/mailer';
+import { MetricsModule } from './fundamentals/metrics';
+import { PrismaModule } from './fundamentals/prisma';
+import { SessionModule } from './fundamentals/session';
+import { RateLimiterModule } from './fundamentals/throttler';
 import { BusinessModules } from './modules';
 import { AuthModule } from './modules/auth';
-import { PrismaModule } from './prisma';
-import { SessionModule } from './session';
-import { RateLimiterModule } from './throttler';
 
 export const FunctionalityModules: Array<Type | DynamicModule> = [
   ConfigModule.forRoot(),
@@ -22,13 +22,9 @@ export const FunctionalityModules: Array<Type | DynamicModule> = [
   SessionModule,
   RateLimiterModule,
   AuthModule,
+  MailModule,
 ];
 
-// better module registration logic
-if (AFFiNE.redis.enabled) {
-  FunctionalityModules.push(RedisModule);
-}
-
 @Module({
   providers: [
     {
@@ -37,6 +33,6 @@ if (AFFiNE.redis.enabled) {
     },
   ],
   imports: [...FunctionalityModules, ...BusinessModules],
-  controllers: SERVER_FLAVOR === 'selfhosted' ? [] : [AppController],
+  controllers: [AppController],
 })
 export class AppModule {}