feat: 增加 GitHub 和 Google 邮箱快捷登录

backend/internal/service/auth_service.go

@@ -775,6 +775,10 @@ func authSourceSignupSettings(defaults *AuthSourceDefaultSettings, signupSource
 		return defaults.OIDC, true
 	case "wechat":
 		return defaults.WeChat, true
+	case "github":
+		return defaults.GitHub, true
+	case "google":
+		return defaults.Google, true
 	default:
 		return ProviderDefaultGrantSettings{}, false
 	}