fix: improve login error handling to distinguish database errors from auth failures

ValidateAndFill now checks the DB query result and returns sentinel errors
(ErrDatabase, ErrInvalidCredentials, ErrUserEmptyCredentials) instead of
hardcoded Chinese strings. The controller maps each sentinel to the
appropriate i18n message, so users see "please contact admin" on DB errors
instead of a misleading "wrong password" message. Non-DB errors still
return a unified vague response to avoid leaking user existence.

i18n/locales/zh-CN.yaml

@@ -3,7 +3,7 @@
 
 # Common messages
 common.invalid_params: "无效的参数"
-common.database_error: "数据库错误，请稍后重试"
+common.database_error: "数据库出错，请联系管理员"
 common.retry_later: "请稍后重试"
 common.generate_failed: "生成失败"
 common.not_found: "未找到"