feat: redirect ctl 추가

Author: xYunaL

src/main/java/org/muses/backendbulidtest251228/domain/member/controller/AuthRedirectCTL.java

@@ -0,0 +1,13 @@
+package org.muses.backendbulidtest251228.domain.member.controller;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class AuthRedirectCTL {
+	@GetMapping("/auth/callback")
+	public ResponseEntity<String> handleCallback() {
+		return ResponseEntity.ok("인증 콜백 페이지입니다. URL의 토큰을 확인하세요.");
+	}
+}