Refactor: Rename create-pakasir-payment to create-payment

- Rename function to abstract payment provider details
- Add support for both QRIS and PayPal methods
- Update frontend to use generic create-payment function
- Remove provider-specific naming from UI/UX
- Payment provider (Pakasir) is now an implementation detail

Response format:
- QRIS: returns qr_string for in-app display, payment_url as fallback
- PayPal: returns payment_url for redirect

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

supabase/config.toml

@@ -45,5 +45,5 @@ verify_jwt = false
 [functions.delete-order]
 verify_jwt = false
 
-[functions.create-pakasir-payment]
+[functions.create-payment]
 verify_jwt = false