Added config library timestamp check to dynamic definition cache invalidation - fixes #523

[philayres]

Summary

Fixes #523. Dynamic definitions now detect YAML config library changes via up_to_date? / refresh_outdated, ensuring stale cached configurations are refreshed across all servers and delayed_job workers.

Changes

app/models/dynamic/def_handler.rb

• latest_stored_update now queries MAX(updated_at) from both definition tables and config_libraries WHERE format = 'yaml', returning the greater value
• up_to_date? tracks @config_library_only_change to distinguish config-library-only changes from definition changes

app/models/dynamic/def_generator.rb

• refresh_outdated handles config-library-only changes by calling force_option_config_parse on definitions with # @library references — skipping full model regeneration

app/jobs/application_job.rb

• Added Application.refresh_dynamic_defs before block.call in around_perform so delayed_job workers detect config library changes

spec/models/dynamic/config_library_cache_invalidation_spec.rb (new)

• 10 tests covering all 8 acceptance criteria (AC1–AC8)

Acceptance Criteria Coverage

AC	Description	Covered
AC1	refresh_outdated detects config library changes	✅
AC2	up_to_date? incorporates config library timestamps	✅
AC3	Only force_option_config_parse (not full regen)	✅
AC4	Only dependent definitions refreshed	✅
AC5	Works in multi-server cluster	✅
AC6	ApplicationJob calls refresh_dynamic_defs	✅
AC7	No regression on direct definition edits	✅
AC8	Minimal performance impact (≤3 queries)	✅