v0.0.27 | Google 소셜 로그인 기능 추가

- Google ID Token 검증 및 로그인/회원가입 기능
- 기존 계정 연동 기능 (비밀번호 확인 후 연동)
- 프로필에서 Google 연동/해제 기능
- CustomUser 모델에 social_provider, social_id, profile_image 필드 추가

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

users/urls.py

@@ -10,6 +10,8 @@ from .views import (
     # KVM 서버 관리
     KVMServerListView, KVMServerDetailView,
     KVMServerActivateView, KVMServerSSHKeyView, KVMServerSSHKeyUploadView,
+    # 소셜 로그인
+    GoogleLoginView, GoogleLinkWithPasswordView, GoogleLinkView, GoogleUnlinkView,
 )
 from rest_framework_simplejwt.views import TokenObtainPairView, TokenRefreshView, TokenVerifyView
 from .views_jwks import jwks_view # django-jwks
@@ -42,4 +44,9 @@ urlpatterns = [
     path('kvm-servers/<int:server_id>/activate/', KVMServerActivateView.as_view(), name='kvm_server_activate'),
     path('kvm-servers/<int:server_id>/ssh-key/', KVMServerSSHKeyView.as_view(), name='kvm_server_ssh_key'),
     path('kvm-servers/<int:server_id>/ssh-key/upload/', KVMServerSSHKeyUploadView.as_view(), name='kvm_server_ssh_key_upload'),
+    # 소셜 로그인
+    path('auth/google/', GoogleLoginView.as_view(), name='google_login'),
+    path('auth/google/link-with-password/', GoogleLinkWithPasswordView.as_view(), name='google_link_with_password'),
+    path('auth/google/link/', GoogleLinkView.as_view(), name='google_link'),
+    path('auth/google/unlink/', GoogleUnlinkView.as_view(), name='google_unlink'),
 ]