feat(50-allegro-shipment-waybill-push): push waybill to allegro checkout form

Phase 50 complete:

- add conditional waybill push for allegro orders only

- add retry on ALLEGRO_HTTP_401 and non-critical failure handling

- add unit tests and update architecture/changelog docs

.paul/phases/50-allegro-shipment-waybill-push/50-01-SUMMARY.md

@@ -0,0 +1,36 @@
+---
+phase: 50-allegro-shipment-waybill-push
+plan: 01
+status: completed
+completed: 2026-03-28
+---
+
+# Phase 50 Plan 01 Summary
+
+## Result
+- Dodano automatyczny push numeru przesylki do Allegro (`POST /order/checkout-forms/{id}/shipments`) po uzyskaniu `tracking_number`.
+- Push wykonuje sie tylko dla zamowien Allegro (`orders.source='allegro'`) z niepustym `source_order_id`.
+- Blad pushu jest niekrytyczny - lokalna paczka pozostaje utworzona.
+- Dodano retry pushu po `ALLEGRO_HTTP_401` z odswiezeniem tokenu.
+
+## Acceptance Criteria
+- AC-1: Pass
+- AC-2: Pass
+- AC-3: Pass
+- AC-4: Pass
+
+## Verification
+- `C:\xampp\php\php.exe -l src/Modules/Shipments/AllegroShipmentService.php` PASS
+- `C:\xampp\php\php.exe -l tests/Unit/AllegroShipmentServiceTest.php` PASS
+- `C:\xampp\php\php.exe vendor/bin/phpunit --filter AllegroShipmentServiceTest --testdox` PASS (4 tests, 54 assertions)
+- `sonar-scanner` PASS (analysis successful): https://sonar.project-pro.pl/dashboard?id=orderPRO
+
+## Files
+- `src/Modules/Shipments/AllegroShipmentService.php`
+- `tests/Unit/AllegroShipmentServiceTest.php`
+- `DOCS/ARCHITECTURE.md`
+- `DOCS/TECH_CHANGELOG.md`
+
+## Notes
+- Brak zmian schematu DB.
+- Brak checkpointow manualnych (plan autonomiczny).