chore(deploy): add production caddy setup

.env.production.example

@@ -0,0 +1,24 @@
+APP_ENV=production
+MONGO_DB_NAME=gapido_auth
+JWT_SECRET_KEY=replace-with-a-long-random-production-secret
+JWT_ISSUER=gapido-auth
+ACCESS_TOKEN_TTL_SECONDS=900
+REFRESH_TOKEN_TTL_SECONDS=604800
+OTP_TTL_SECONDS=120
+OTP_MAX_ATTEMPTS=5
+OTP_REQUEST_LIMIT=3
+OTP_REQUEST_WINDOW_SECONDS=300
+
+# Choose exactly one real provider in production: kavenegar or sms_ir.
+SMS_PROVIDER=sms_ir
+KAVENEGAR_API_KEY=
+KAVENEGAR_LOGIN_TEMPLATE=login-otp
+SMS_IR_API_KEY=replace-with-real-sms-ir-key
+SMS_IR_VERIFY_TEMPLATE_ID=570574
+
+ADMIN_MOBILE=989120000000
+DEMO_ENABLE_DEBUG_OTP=false
+DEMO_DEBUG_SMS_TTL_SECONDS=300
+GRPC_HOST=0.0.0.0
+GRPC_PORT=50051
+