Implement LdapFormViewModel for editing LDAP configuration section with
properties for ServerUrlsText, GroupDn, SearchBase, ConnectionTimeoutSeconds,
UseFakeAuth, and AdminBypassUsersText. Array properties use newline-separated
text with StringSplitOptions.RemoveEmptyEntries | TrimEntries for splitting.
Implements Task 18 from phases 7-9 plan. SearchFormViewModel wraps
SearchSection model with properties for MaxResultRows, TimeoutSeconds,
and MaxConcurrentSearches. Includes full test coverage with 7 tests
verifying initialization, two-way binding, change notification, and
null argument handling.
Joseph Doherty