docs: README 문서 개선

pooreumjung · pooreumjung · commit 695e8d9ee3d3 · 2026-06-01T22:52:04.000+09:00
diff --git a/README.md b/README.md
@@ -23,7 +23,7 @@ flowchart LR
   API --> KAKAO[Kakao OAuth]
   API --> FCM[Firebase FCM]
 
-  API --> ACTUATOR[Actuator + Prometheus]
+  PROM[Prometheus] -->|Scrape /actuator/prometheus| API
 ```
 
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