fix: 三个询盘导入命令——未分到询盘的用户不再发送空汇总邮件

sendDigests 循环前校验该用户分配条数，为0则跳过并提示
"user N 未分到询盘，不发送"（询盘数少于人数时避免群发空邮件）。

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

app/command/HesuGoogleAiInquiryImportCommand.php

@@ -468,6 +468,10 @@ class HesuGoogleAiInquiryImportCommand extends Command
         $date = date('Y-m-d');
 
         foreach ($targetUserIds as $uid) {
+            if (count($digestGroups[(string)$uid] ?? []) === 0) {
+                $output->writeln('<comment>user ' . $uid . ' 未分到询盘，不发送</comment>');
+                continue;
+            }
             if ($onlyUser > 0 && $uid !== $onlyUser) {
                 continue;
             }