chore: add deployment runbook and server configs for kittisak.com

serverinfo/kittisak-backend.env.example

@@ -0,0 +1,8 @@
+PORT=3054
+DATABASE_URL="postgresql://postgres:password@localhost:5132/kittisakdb?schema=public"
+NODE_ENV=production
+APP_URL="https://api.kittisak.com"
+BACKEND_PUBLIC_URL="https://api.kittisak.com"
+CORS_ORIGIN="https://admin.kittisak.com,https://spa.kittisak.com,https://kittisak.com"
+JWT_SECRET="replace-with-kittisak-production-secret"
+OMISE_SECRET_KEY=""