fix: remove unused _yaml_scalar and redundant isinstance guard

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

bot_bottle/backend/docker/egress_apply.py

@@ -183,8 +183,6 @@ def _merge_single_route(
                                 new_paths.append(val)
                                 existing_paths.add(val)
                 if new_paths:
-                    if not isinstance(existing_matches, list):
-                        existing_matches = []
                     existing_matches.append(
                         {"paths": [{"value": p} for p in new_paths]}
                     )

bot_bottle/egress.py

@@ -186,14 +186,6 @@ def _route_to_yaml_fields(r: Route) -> dict[str, object]:
     return fields
 
 
-def _yaml_scalar(v: object) -> str:
-    if isinstance(v, bool):
-        return "true" if v else "false"
-    if isinstance(v, str):
-        return f'"{v}"'
-    return str(v)
-
-
 def egress_render_routes(
     routes: tuple[EgressRoute, ...],
 ) -> str: