refactor: extract config warning log formatter

src/core/services/config-warning-runtime-service.ts

@@ -0,0 +1,14 @@
+import { ConfigValidationWarning } from "../../types";
+
+export function formatConfigWarningRuntimeService(
+  warning: ConfigValidationWarning,
+): string {
+  return `[config] ${warning.path}: ${warning.message} value=${JSON.stringify(warning.value)} fallback=${JSON.stringify(warning.fallback)}`;
+}
+
+export function logConfigWarningRuntimeService(
+  warning: ConfigValidationWarning,
+  log: (message: string) => void,
+): void {
+  log(formatConfigWarningRuntimeService(warning));
+}