[Feat] Member, Challenger 도메인 기초 엔티티 기초 설계 & OAuth 기초 생성

.github/copilot-instructions.md

@@ -315,7 +315,7 @@ public class ChallengerRequest {
 ### File Names
 
 | Type       | Pattern                                | Example                             |
-| ---------- | -------------------------------------- | ----------------------------------- |
+|------------|----------------------------------------|-------------------------------------|
 | Entity     | `{Domain}.java`                        | `Challenger.java`                   |
 | Enum       | `{Domain}{Type}.java`                  | `ChallengerStatus.java`             |
 | UseCase    | `{Action}{Domain}UseCase.java`         | `RegisterChallengerUseCase.java`    |

build.gradle.kts

@@ -61,6 +61,7 @@ dependencies {
     implementation("org.springframework.boot:spring-boot-starter-aop")
     implementation("org.springframework.boot:spring-boot-starter-actuator")
     implementation("org.springframework.boot:spring-boot-starter-security")
+    implementation("org.springframework.boot:spring-boot-starter-oauth2-client")  // OAuth2 Client
     implementation("org.springframework.boot:spring-boot-starter-data-jpa")
 
     // JWT