Init first files

.env.example

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+# App
+APP_NAME=NexaPG Monitor
+ENVIRONMENT=dev
+LOG_LEVEL=INFO
+
+# Core DB
+DB_NAME=nexapg
+DB_USER=nexapg
+DB_PASSWORD=nexapg
+DB_PORT=5433
+
+# Backend
+BACKEND_PORT=8000
+JWT_SECRET_KEY=change_this_super_secret
+JWT_ALGORITHM=HS256
+JWT_ACCESS_TOKEN_MINUTES=15
+JWT_REFRESH_TOKEN_MINUTES=10080
+# Generate with: python -c "from cryptography.fernet import Fernet; print(Fernet.generate_key().decode())"
+ENCRYPTION_KEY=REPLACE_WITH_FERNET_KEY
+CORS_ORIGINS=http://localhost:5173,http://localhost:8080
+POLL_INTERVAL_SECONDS=30
+INIT_ADMIN_EMAIL=admin@example.com
+INIT_ADMIN_PASSWORD=ChangeMe123!
+
+# Frontend
+FRONTEND_PORT=5173
+VITE_API_URL=http://localhost:8000/api/v1