fix: traefik json logs when RouterName property is omitted (#1644)

* fix: traefik json logs when RouterName property is omitted

Add nil check for RouterName before parsing router components to prevent
errors when the property is missing from Traefik JSON logs.

Fixes #1643

* test: add assertions for traefik RouterName nil case

* docs: add comments explaining RouterName nil handling

* refactor: make it less complex

* refactor: make static less complex

Author: LaurenceJJones