feat: xmpp bot最终修复版+skill文档同步

xmpp_agent_core.py 当前工作配置记录:
1. send_presence() — presence = available, 否则私聊进离线
2. 入站消息队列(_inbound_queue) — 崩了不丢, 重试3次
3. 出站队列(_outbound_queue) — 崩了自动重启
4. XMPP心跳检测(xep_0199 ping) — run_filters死后15s内重连
5. 私聊回复双通道: send_message(指定resource) + send_stanza(裸JID)
6. AGENT_MENTION动态解析(群聊@知微识别)
7. session_id保持xmpp-zhiwei-v2不变(不因重启换session)
8. 断线重连2秒延迟(防资源冲突)

data/stocks/00981.json

@@ -56,6 +56,11 @@
       "content": "**中芯国际(688981/00981)** — 科创/半导体板块资金巨量流入，A股+6.94%收151.53，港股放量218M。持有信号，科技主线延续。",
       "report_id": "cron_99c06255590a_2026-06-25_08-33-37"
     },
+    {
+      "time": "2026-06-26T08:55:32.944422",
+      "content": "**中芯国际H(00981)** 现价86.0距TP87.26仅1.5%，接近止盈",
+      "report_id": "cron_99c06255590a_2026-06-26_08-43-03"
+    },
     {
       "time": "2026-06-02T12:55:54.836964",
       "content": "• 中芯国际H(00981) ¥82.20 +3.46% — 高于买入区72-75",