Make authentication mode and credentials configurable via CLI

Replace hardcoded user/password credentials with a new <auth-mode>
parameter that accepts "anonymous" or "user".  When "user" is chosen,
two additional <username> <password> arguments are required.

ServerRegister accepts two independent auth modes: one for its own
server-side access control and one for authenticating to the LDS when
registering.  ClientFindServers passes credentials to readServerTime,
which selects UA_Client_connectUsername or UA_Client_connect accordingly.

Update CLAUDE.md running examples and add an auth modes table.

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