chore/#79: dotenv 패키지 제거

Author: DandelionQZ

TinyBite/package-lock.json

@@ -18,7 +18,6 @@
     "@react-navigation/native": "^7.1.8",
     "@tanstack/react-query": "^5.90.12",
     "axios": "^1.13.2",
-    "dotenv": "^17.2.3",
     "expo": "~54.0.29",
     "expo-constants": "~18.0.10",
     "expo-crypto": "~15.0.8",