artifact: apps/server/src/main/kotlin/com/correx/apps/server/ServerModule.kt
purpose: Add routerFacade: RouterFacade field to ServerModule data class so SessionStreamHandler can access the router facade.
depends_on: task-013
non_goals: Creating RouterFacade, wiring the facade in InfrastructureModule
done_when: ServerModule compiles with the new routerFacade parameter and is referenced by SessionStreamHandler
