fix: Prevent credential sharing errors for shared hosts

- Skip credential resolution for shared hosts with credential authentication
  to prevent decryption errors (credentials are encrypted per-user)
- Add warning alert in sharing tab when host uses credential authentication
- Inform users that shared users cannot connect to credential-based hosts
- Add translations for credential sharing warning (EN/ZH)

This prevents authentication failures when sharing hosts configured
with credential authentication while maintaining security by keeping
credentials isolated per user.

src/locales/zh/translation.json

@@ -1749,6 +1749,8 @@
     "cannotRemoveSystemRole": "无法移除系统角色",
     "cannotShareWithSelf": "不能与自己共享主机",
     "noCustomRolesToAssign": "没有可用的自定义角色。系统角色已自动分配。",
+    "credentialSharingWarning": "不支持共享使用凭据认证的主机",
+    "credentialSharingWarningDescription": "此主机使用凭据认证。由于凭据是按用户加密的无法共享,共享用户将无法连接。请为计划共享的主机使用密码或密钥认证。",
     "auditLogs": "审计日志",
     "viewAuditLogs": "查看审计日志",
     "action": "操作",