refactor(modules): mark DatabaseModule and CryptoModule as global and remove redundant imports

Optimize module imports by marking `DatabaseModule` and `CryptoModule` as global. Remove explicit imports from other modules to reduce duplication and improve maintainability. Update environment variable limits for image and GIF sizes in production.

backend/src/users/users.module.ts

@@ -1,7 +1,5 @@
 import { forwardRef, Module } from "@nestjs/common";
 import { AuthModule } from "../auth/auth.module";
-import { CryptoModule } from "../crypto/crypto.module";
-import { DatabaseModule } from "../database/database.module";
 import { MediaModule } from "../media/media.module";
 import { S3Module } from "../s3/s3.module";
 import { UsersRepository } from "./repositories/users.repository";
@@ -9,13 +7,7 @@ import { UsersController } from "./users.controller";
 import { UsersService } from "./users.service";
 
 @Module({
-	imports: [
-		DatabaseModule,
-		CryptoModule,
-		forwardRef(() => AuthModule),
-		MediaModule,
-		S3Module,
-	],
+	imports: [forwardRef(() => AuthModule), MediaModule, S3Module],
 	controllers: [UsersController],
 	providers: [UsersService, UsersRepository],
 	exports: [UsersService, UsersRepository],