refactor(server): 优化登录锁定提示文案和时长计算逻辑

更新了loginLockedMessage函数，细化了锁定时长的提示分级，增加了过期回退文案，让提示更准确友好

server/login_lockout.go

@@ -41,13 +41,27 @@ func tenantLoginRateLimitPolicy(tenantCode string) (types.LoginRateLimitPolicy,
 	return policy.LoginRateLimit.Normalized()
 }
 
-// loginLockedMessage renders the user-facing lockout message with the rounded
-// down remaining minutes; sub-minute remainders are reported as "within 1 minute".
+// loginLockedMessage renders the user-facing lockout message: sub-minute
+// remainders are reported as "within 1 minute", sub-hour as "within 1 hour",
+// sub-day rounded down to whole hours, otherwise rounded down to whole days.
+// A non-positive remaining time (e.g. the lock already expired while rendering)
+// falls back to a generic message instead of a misleading duration.
 func loginLockedMessage(retryAfter time.Duration) string {
-	if minutes := int(retryAfter.Minutes()); minutes >= 1 {
-		return fmt.Sprintf("登录错误次数过多，账号已锁定，请 %d 分钟后再试", minutes)
+	const fallback = "登录错误次数过多，账号已锁定，请稍后再试或联系管理员"
+	if retryAfter <= 0 {
+		return fallback
+	}
+	prefix := "登录错误次数过多，账号已锁定，请 "
+	switch {
+	case retryAfter < time.Minute:
+		return prefix + "1 分钟以内再试"
+	case retryAfter < time.Hour:
+		return prefix + "1 小时以内再试"
+	case retryAfter < 24*time.Hour:
+		return fmt.Sprintf("%s%d 小时后再试", prefix, int(retryAfter.Hours()))
+	default:
+		return fmt.Sprintf("%s%d 天后再试", prefix, int(retryAfter.Hours())/24)
 	}
-	return "登录错误次数过多，账号已锁定，请 1 分钟内再试"
 }
 
 // loginLockoutGuard enforces the configured login failure lockout for one