From a conceptual perspective, "Router Role" and "Router Service" represent two well-separated concepts: a shard node may temporarily assume a "Router Role" to gain the capability of interacting with a "Router Service" (either embedded or external), which is defined by a ServiceEntryPoint, {{CommandRegistry }}

Nevertheless, the current state of the server codebase does not clearly reflect this separation: in particular, the "Router Role" expression is often misused or blended with other concerns. As an example, service_entry_point_router_role.cpp contains logic that defines the behavior of the "Router Service Entry Point".

The objective of this ticket is to audit existing usages of "router role" terminology in the existing code/file names and correct potential inconsistencies.