fix(payments): improve payment activation error handling

Add validation for provider payment IDs in YooKassa webhook processing and ensure activation details are checked for null values in CryptoPay, FreeKassa, Platega, and Stars services. This prevents potential runtime errors during payment processing and enhances logging for better debugging.

bot/services/freekassa_service.py

@@ -378,6 +378,10 @@ class FreeKassaService:
                     sale_mode=sale_mode,
                     traffic_gb=months if sale_mode == "traffic" else None,
                 )
+                if not activation or not activation.get("end_date"):
+                    raise RuntimeError(
+                        f"FreeKassa webhook: activation failed for payment {payment.payment_id}"
+                    )
 
                 referral_bonus = None
                 if sale_mode != "traffic":