33e1802e6d
Code-review finding UI-Med-2: the design doc + delivery adapter treat FromNumber and MessagingServiceSid as either-or, but the entity ctor, EF schema, UI and CLI all hard- required FromNumber — so a Messaging-Service-only Twilio config (a normal production setup) could not be created. Bring the implementation into line with the spec: - Commons: SmsConfiguration.FromNumber -> string? (ctor fromNumber optional); UpdateSmsConfigCommand.FromNumber -> string?. - ConfigurationDatabase: FromNumber.IsRequired(false) + migration SmsFromNumberOptional (ALTER COLUMN nullable, idempotent; Down backfills '' — harmless, MsgSid keeps it deliverable) + regenerated model snapshot. - Transport: SmsConfigDto.FromNumber -> string? (round-trips a Messaging-Service-only config). - CentralUI: form validation requires AccountSid + at-least-one-of(FromNumber, MsgSid); nullable create/edit paths; From-number help text. - CLI: --from-number no longer Required; BuildUpdateSmsConfigCommand validates the either-or. - Adapter: From branch null-forgiving (guarded by the existing incomplete-config check). Tests: ManagementActor MsgSid-only persists null FromNumber; CLI MsgSid-only builds + neither-throws + contract (--from-number not Required); CentralUI MsgSid-only save.