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/auth/auth.module.ts

@@ -1,6 +1,4 @@
 import { forwardRef, Module } from "@nestjs/common";
-import { CryptoModule } from "../crypto/crypto.module";
-import { DatabaseModule } from "../database/database.module";
 import { SessionsModule } from "../sessions/sessions.module";
 import { UsersModule } from "../users/users.module";
 import { AuthController } from "./auth.controller";
@@ -12,12 +10,7 @@ import { RbacService } from "./rbac.service";
 import { RbacRepository } from "./repositories/rbac.repository";
 
 @Module({
-	imports: [
-		forwardRef(() => UsersModule),
-		CryptoModule,
-		SessionsModule,
-		DatabaseModule,
-	],
+	imports: [forwardRef(() => UsersModule), SessionsModule],
 	controllers: [AuthController],
 	providers: [
 		AuthService,