fix(feishu): decouple trigger ingest from the Lark WS dispatch thread (#208)

ChannelMessageEventBridge.onChannelMessage() ran synchronously on the Lark
SDK WebSocket dispatch thread; when the DB pool was saturated its ingest
query blocked that thread and subsequent messages were silently dropped.

- @Async moves trigger ingest onto the (vthread + SecurityContext-propagating)
  async executor, freeing the WS dispatch thread.
- Add a 10s timeout to the refreshTenantAccessToken() HTTP request, which
  previously had none.

Scope narrowed per review to only fix #208: the @mention alias learning and
session-id changes are dropped (to be raised as separate PRs), and dev's
existing message dedup is left untouched.

Closes #208

mateclaw-server/src/main/java/vip/mate/channel/feishu/FeishuChannelAdapter.java

@@ -794,6 +794,7 @@ public class FeishuChannelAdapter extends AbstractChannelAdapter implements Stre
             HttpRequest request = HttpRequest.newBuilder()
                     .uri(URI.create(apiBase + "/open-apis/auth/v3/tenant_access_token/internal"))
                     .header("Content-Type", "application/json; charset=utf-8")
+                    .timeout(Duration.ofSeconds(10))
                     .POST(HttpRequest.BodyPublishers.ofString(jsonBody))
                     .build();
 

mateclaw-server/src/main/java/vip/mate/trigger/dispatch/ChannelMessageEventBridge.java

@@ -3,6 +3,7 @@ package vip.mate.trigger.dispatch;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.context.event.EventListener;
+import org.springframework.scheduling.annotation.Async;
 import org.springframework.stereotype.Component;
 import vip.mate.channel.event.ChannelMessageReceivedEvent;
 import vip.mate.trigger.ingest.TriggerEventEnvelope;
@@ -31,6 +32,7 @@ public class ChannelMessageEventBridge {
 
     private final TriggerEventIngestService ingestService;
 
+    @Async
     @EventListener
     public void onChannelMessage(ChannelMessageReceivedEvent event) {
         if (event == null) return;