feat:

1、多 key 默认拼成 1 条企微通知
2、UTF-8 超过 4096 字节 → 按 key 拆开，每条带完整抬头，依次发送
3、条间间隔 200ms，降低机器人限频风险
4、CI 控制台会标明「超长已按 key 拆为 N 条」并逐条打印

src/main/java/com/codechecker/cache/cli/CacheSchemaCheckerMain.java

@@ -11,6 +11,7 @@ import picocli.CommandLine.Command;
 import picocli.CommandLine.Option;
 
 import java.nio.file.Path;
+import java.util.List;
 import java.util.concurrent.Callable;
 
 /**
@@ -81,9 +82,11 @@ public class CacheSchemaCheckerMain implements Callable<Integer> {
                     && (report.hasChanges() || config.getNotify().isNotifyOnClean());
             if (shouldNotify && !dryRun) {
                 String webhook = config.getNotify().getWebhookUrl();
-                String markdown = builder.toMarkdown(report);
-                boolean ok = new WeComNotifier().sendMarkdown(webhook, markdown);
-                System.out.println("[cache-schema-checker] 企微通知发送: " + (ok ? "成功" : "失败/跳过"));
+                List<String> messages = builder.toWeComMessages(report);
+                int ok = new WeComNotifier().sendMarkdownMessages(webhook, messages);
+                System.out.println("[cache-schema-checker] 企微通知发送: "
+                        + ok + "/" + messages.size()
+                        + (messages.size() > 1 ? "（已按 key 拆分）" : ""));
             }
 
             if (report.isBlocked()) {