refactor(health): use type import for Cache from cache-manager

backend/src/health.controller.ts

@@ -1,6 +1,6 @@
 import { CACHE_MANAGER } from "@nestjs/cache-manager";
 import { Controller, Get, Inject } from "@nestjs/common";
-import { Cache } from "cache-manager";
+import type { Cache } from "cache-manager";
 import { sql } from "drizzle-orm";
 import { DatabaseService } from "./database/database.service";
 

backend/tsconfig.json

@@ -4,7 +4,7 @@
 		"moduleResolution": "nodenext",
 		"resolvePackageJsonExports": true,
 		"esModuleInterop": true,
-		"isolatedModules": false,
+		"isolatedModules": true,
 		"declaration": true,
 		"removeComments": true,
 		"emitDecoratorMetadata": true,