feat: add per-project message trigger wait queue

- TriggerQueue: FIFO per-project queue, max 5 items, 5min TTL expiry
- Replace reject-when-locked with queue: users get position feedback
- Run completion auto-starts next queued trigger (skips expired items)
- /reset clears project queue; 60s periodic purge interval
- Add unit tests (10) for queue lifecycle and edge cases

hub/src/server.ts

@@ -16,6 +16,7 @@ import { prisma } from "./db.js";
 import { createEnvRuntimeSettings } from "./settings/runtime.js";
 import { createLarkClient, startFeishuListenerWithClient } from "./feishu/client.js";
 import { makeTriggerHandler } from "./feishu/trigger.js";
+import { triggerQueue } from "./feishu/triggerQueue.js";
 
 function requireEnv(name: string): string {
   const v = process.env[name];
@@ -61,6 +62,13 @@ async function main(): Promise<void> {
   if (feishuListenerEnabled) {
     const feishuConfig = { appId: feishuAppId, appSecret: feishuAppSecret, botOpenId: feishuBotOpenId };
     const larkClient = createLarkClient(feishuConfig);
+    const triggerQueuePurgeTimer = setInterval(() => {
+      const removed = triggerQueue.purgeExpired();
+      if (removed > 0) {
+        app.log.info({ removed }, "feishu trigger queue: purged expired triggers");
+      }
+    }, 60_000);
+    triggerQueuePurgeTimer.unref();
     const trigger = makeTriggerHandler({ prisma, settings: runtimeSettings, logger: app.log });
     startFeishuListenerWithClient(feishuConfig, larkClient, app.log, trigger, trigger.onCardAction);
   } else {