[CORE-371] Fix Form List Deadline Filter for Null-Deadline Forms

[dytsou]

Type of changes

• Fix
• Test

Purpose

• Include forms with deadline IS NULL when excludeExpired=true in form list query
• Add integration tests for ListExcludeExpired behavior
• Resolve issue CORE-371

Additional Information

• SQL change: f.deadline IS NULL OR f.deadline >= deadline_after
• Jira: https://clustron.atlassian.net/browse/CORE-371

[Dada8825252]

Could you fix the mixed receiver issue in response/service.go? GetEditInfo uses a pointer receiver while all other Service methods use value receivers — Go recommends keeping them consistent within a type. Since the struct holds multiple dependencies, standardizing on pointer receivers across all methods would be the more idiomatic choice.