fix: expose refresh token and current user API

[heodongun]

Summary

• return refreshToken in login/refresh responses while preserving cookie delivery
• add GET /users/me for authenticated current-user lookup
• stabilize user service OpenAPI/health support for gateway-facing docs

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: be3d1ad2-126d-47da-a228-a2fcf3a89402

📥 Commits

Reviewing files that changed from the base of the PR and between 3a1d3a1 and b105f0d.

📒 Files selected for processing (19)

• build.gradle
• compose.yml
• src/main/java/gajeman/jagalchi/jagalchiserver/application/user/service/QueryUserByNameCommand.java
• src/main/java/gajeman/jagalchi/jagalchiserver/application/user/usecase/QueryUserByNameUseCase.java
• src/main/java/gajeman/jagalchi/jagalchiserver/application/verification/service/SendVerificationCodeCommand.java
• src/main/java/gajeman/jagalchi/jagalchiserver/global/config/OpenApiConfig.java
• src/main/java/gajeman/jagalchi/jagalchiserver/global/config/SecurityConfig.java
• src/main/java/gajeman/jagalchi/jagalchiserver/global/config/WebConfig.java
• src/main/java/gajeman/jagalchi/jagalchiserver/infrastructure/cookie/CookieUtil.java
• src/main/java/gajeman/jagalchi/jagalchiserver/infrastructure/jwt/service/TokenService.java
• src/main/java/gajeman/jagalchi/jagalchiserver/infrastructure/mail/MailUtil.java
• src/main/java/gajeman/jagalchi/jagalchiserver/infrastructure/oauth2/OAuth2LoginSuccessHandler.java
• src/main/java/gajeman/jagalchi/jagalchiserver/presentation/auth/AuthController.java
• src/main/java/gajeman/jagalchi/jagalchiserver/presentation/auth/dto/response/LoginResponse.java
• src/main/java/gajeman/jagalchi/jagalchiserver/presentation/health/HealthController.java
• src/main/java/gajeman/jagalchi/jagalchiserver/presentation/user/FollowController.java
• src/main/java/gajeman/jagalchi/jagalchiserver/presentation/user/UserController.java
• src/main/resources/application.yml
• src/test/java/gajeman/jagalchi/jagalchiserver/application/verification/SendVerificationCodeCommandTest.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/user-auth-swagger-fixes

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