fix(feishu): commit findByFeishuUserId repository method (missed)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/services/agent-service/src/infrastructure/repositories/agent-instance.repository.ts

@@ -31,6 +31,10 @@ export class AgentInstanceRepository {
     return this.repo.findOne({ where: { dingTalkUserId, status: Not('removed') } as any });
   }
 
+  findByFeishuUserId(feishuUserId: string): Promise<AgentInstance | null> {
+    return this.repo.findOne({ where: { feishuUserId, status: Not('removed') } as any });
+  }
+
   save(instance: AgentInstance): Promise<AgentInstance> {
     return this.repo.save(instance);
   }