Booking lifecycle notifications and status updates

backend/salon_api/settings.py

@@ -26,6 +26,7 @@ INSTALLED_APPS = [
     "apps.salons",
     "apps.bookings",
     "apps.payments",
+    "apps.notifications",
 ]
 
 MIDDLEWARE = [
@@ -140,3 +141,5 @@ OTP_MAX_PER_WINDOW = int(os.getenv("OTP_MAX_PER_WINDOW", "5"))
 OTP_WINDOW_MINUTES = int(os.getenv("OTP_WINDOW_MINUTES", "15"))
 OTP_RESEND_COOLDOWN_SECONDS = int(os.getenv("OTP_RESEND_COOLDOWN_SECONDS", "60"))
 DEFAULT_CURRENCY = os.getenv("DEFAULT_CURRENCY", "SAR")
+NOTIFICATION_PROVIDER = os.getenv("NOTIFICATION_PROVIDER", OTP_PROVIDER)
+NOTIFICATION_DEFAULT_CHANNEL = os.getenv("NOTIFICATION_DEFAULT_CHANNEL", "sms")