Summary

• Closes Remove this unread private field '_systemClock' or refactor the code to use its value. #544
• Closes Remove this unread private field '_serviceProvider' or refactor the code to use its value. #545

What & Why

• Removed the unused system clock dependency from the workflow triggers list handler so it only relies on the services it actually calls.
• Cleaned the associated using directives so the handler matches the rest of the application layering conventions.
• Dropped the unused service provider field from the result storage factory and kept the existing guard clauses focused on the remaining dependencies to reduce confusion for new contributors.

Design Decisions

• Left the existing logging and pagination flow untouched to stay consistent with the surrounding handlers.
• Reordered the factory constructor assignments to keep null-checks and configuration logic aligned with the pattern used across infrastructure services.

Testing

• .dotnet/dotnet build FlowSynx.sln --configuration Release
• .dotnet/dotnet test FlowSynx.sln --configuration Release --no-build

Alignment

• Changes follow the repository's guard-clause pattern and reuse the existing localization and pagination utilities without introducing new abstractions.
• No new tests were required because existing unit coverage already exercises the affected entry points.