Update backend/.env.example via Son of Anton

backend/.env.example

-# ============================================
-# THE GRIND — Backend Environment Variables
-# ============================================
-
-# Application
-NODE_ENV=development
-PORT=3001
-FRONTEND_URL=http://localhost:3000
-API_PREFIX=api
-CORS_ORIGINS=http://localhost:3000
-
 # Database
 DATABASE_URL=postgresql://postgres:postgres@localhost:5432/thegrind?schema=public
 
 # Redis
 REDIS_HOST=localhost
 REDIS_PORT=6379
-# REDIS_PASSWORD=
-REDIS_DB=0
+REDIS_PASSWORD=
 
 # JWT
-JWT_SECRET=CHANGE_ME_IN_PRODUCTION_OR_GET_HACKED_YOU_IDIOT
+JWT_SECRET=CHANGE_ME_TO_A_RANDOM_64_CHAR_STRING_IN_PRODUCTION
 JWT_ACCESS_EXPIRY=15m
 JWT_REFRESH_EXPIRY=7d
 JWT_REFRESH_EXPIRY_DAYS=7
 
-# MinIO (S3-compatible storage)
+# App
+PORT=3001
+NODE_ENV=development
+FRONTEND_URL=http://localhost:3000
+CORS_ORIGINS=http://localhost:3000
+API_PREFIX=api
+
+# MinIO
 MINIO_ENDPOINT=localhost
 MINIO_PORT=9000
 MINIO_USE_SSL=false
@@ -32,12 +27,7 @@ MINIO_ACCESS_KEY=minioadmin
 MINIO_SECRET_KEY=minioadmin
 MINIO_BUCKET=hr-files
 
-# Upload Limits
-MAX_FILE_SIZE_BYTES=26214400
-MAX_PROFILE_PHOTO_SIZE_BYTES=5242880
-
-# Session & Security
+# Session
 SESSION_TIMEOUT_HOURS=8
 MAX_LOGIN_ATTEMPTS=5
 LOCKOUT_DURATION_MINUTES=30
\ No newline at end of file
-MAX_DAILY_LOGIN_ATTEMPTS=15
\ No newline at end of file