offline 스코프 제거, rp_claims 값 표준화

docs/devfront_auth_flow_explanation.md

@@ -64,12 +64,12 @@ sequenceDiagram
 
 ### 자동 등록된 `devfront` 명세
 ```bash
-hydra clients create 
-  --endpoint http://hydra:4445 
-  --id devfront 
-  --grant-types authorization_code,refresh_token 
-  --response-types code 
-  --scope openid,offline_access,profile,email 
+hydra clients create
+  --endpoint http://hydra:4445
+  --id devfront
+  --grant-types authorization_code,refresh_token
+  --response-types code
+  --scope openid,profile,email
   --token-endpoint-auth-method none \ # Public Client (PKCE 사용)
   --callbacks http://localhost:5174/auth/callback;
 ```