CreateLdapConfigDto's optional fields (searchFilter, syncIntervalMin,
isActive, groupFilterDns) had class-field default initializers.
NestJS's ValidationPipe instantiates DTOs via plainToInstance, which
applies those defaults even when the field is absent from the request
body -- so any partial PATCH not including a given field silently
reset it to the hardcoded default instead of leaving it untouched.
Caught by testing the new groupFilterDns-only PATCH: saving the group
filter alone reset searchFilter back to "(objectClass=person)",
clobbering the configured Active Directory filter. The service layer
already has its own `?? default` fallback for create, so the DTO
initializers were redundant and unsafe. Removing them makes updateConfig's
existing "only set if dto.field !== undefined" pattern behave correctly
for every optional field, not just the ones sent together in one request.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
schalli
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