CLI: support replication prefix setting

[mother-6000]

Parent: reductstore/reductstore#1487
Core implementation: reductstore/reductstore#1486
Original feature request: reductstore/reductstore#1466

ReductStore Core now supports replication prefix in the HTTP API and RS_REPLICATION_<ID>_PREFIX provisioning. The setting prepends only the destination entry path: source camera/front with prefix robot-1 becomes destination robot-1/camera/front.

Scope:

• Add a prefix option to replication/replica create and update commands.
• Include the field in output/config serialization where replication settings are displayed or exported.
• Preserve backward compatibility when the option is omitted.

Acceptance criteria:

• CLI can create/update a replication task with destination prefix.
• CLI output makes the configured prefix visible.
• Tests cover create/update parsing and omitted-prefix behavior.