Fix crypto watcher crash by adding missing app property to ShopContextRequestWrapper

The wrapper class wasn't properly exposing the app attribute needed for email
sending during payment finalization. This caused AttributeError crashes when
processing real payments. Added explicit app property to ensure proper access.

make_post_sell/lib/crypto_watcher.py

@@ -345,6 +345,11 @@ class ShopContextRequestWrapper:
     def host_url(self):
         return self._host_url
 
+    @property
+    def app(self):
+        """Proxy app attribute from original request."""
+        return getattr(self._original_request, 'app', {})
+
 
 def create_shop_context_request(env_request, crypto_payment: CryptoPayment):
     """Create a request wrapper with shop domain context for email generation."""