feat: multimodal image clients, workspaces, Tushare skill, test fixes

- Replace monolithic image_message_client with HTTP/OCR/legacy modules; tighten OpenAI transport + tool schemas for multimodal downgrade to OCR specialist path.
- Add image/stock workspace prompts (META/SOUL/ROLE_SYSTEM); register experts; tweak specialist agent/direct loop/query_image_attachment.
- Add bundled runtime/skills/tushare-finance (references, api_client, SKILL metadata).
- Document OCR-related env vars; admin chat tweaks; README; weixin_install Ensure-OfficialPluginRuntimeDeps helper.
- Tests: multimodal downgrade + OCR coverage, strict tool pairing in attachment replay guard, workspace contract skips _internal/_system dirs, router/trace/prompt guards.

Co-authored-by: Cursor <cursoragent@cursor.com>

runtime/skills/tushare-finance/reference/接口文档/股票开户数据(停).md

@@ -0,0 +1,123 @@
+# 股票开户数据（停）
+
+**文档ID**: 164
+**原始链接**: https://tushare.pro/document/2?doc_id=164
+
+---
+
+## 股票账户开户数据
+
+接口：stk_account描述：获取股票账户开户数据，统计周期为一周积分：600积分可调取，具体请参阅积分获取办法
+
+注：此数据官方已经停止更新。
+
+输入参数
+
+<table>
+<thead>
+<tr>
+<th>名称</th>
+<th>类型</th>
+<th>必选</th>
+<th>描述</th>
+</tr>
+</thead>
+<tbody><tr>
+<td>date</td>
+<td>str</td>
+<td>N</td>
+<td>日期</td>
+</tr>
+<tr>
+<td>start_date</td>
+<td>str</td>
+<td>N</td>
+<td>开始日期</td>
+</tr>
+<tr>
+<td>end_date</td>
+<td>str</td>
+<td>N</td>
+<td>结束日期</td>
+</tr>
+</tbody></table>
+输出参数
+
+<table>
+<thead>
+<tr>
+<th>名称</th>
+<th>类型</th>
+<th>默认显示</th>
+<th>描述</th>
+</tr>
+</thead>
+<tbody><tr>
+<td>date</td>
+<td>str</td>
+<td>Y</td>
+<td>统计周期</td>
+</tr>
+<tr>
+<td>weekly_new</td>
+<td>float</td>
+<td>Y</td>
+<td>本周新增（万）</td>
+</tr>
+<tr>
+<td>total</td>
+<td>float</td>
+<td>Y</td>
+<td>期末总账户数（万）</td>
+</tr>
+<tr>
+<td>weekly_hold</td>
+<td>float</td>
+<td>Y</td>
+<td>本周持仓账户数（万）</td>
+</tr>
+<tr>
+<td>weekly_trade</td>
+<td>float</td>
+<td>Y</td>
+<td>本周参与交易账户数（万）</td>
+</tr>
+</tbody></table>
+接口使用
+
+```
+
+pro = ts.pro_api()
+
+df = pro.stk_account(start_date='20180101', end_date='20181231')
+
+```
+
+数据示例
+
+```
+    date      weekly_new     total weekly_hold weekly_trade
+0   20181228       20.81  14650.44        None         None
+1   20181221       21.04  14629.63        None         None
+2   20181214       21.21  14608.59        None         None
+3   20181207       22.28  14587.38        None         None
+4   20181130       23.56  14565.10        None         None
+5   20181123       24.16  14541.54        None         None
+6   20181116       24.57  14517.38        None         None
+7   20181109       24.11  14492.81        None         None
+8   20181102       23.97  14468.70        None         None
+9   20181026       26.00  14444.73        None         None
+10  20181019       24.13  14418.73        None         None
+11  20181012       25.30  14394.60        None         None
+12  20180928       20.09  14369.30        None         None
+13  20180921       23.24  14349.21        None         None
+14  20180914       24.08  14325.97        None         None
+15  20180907       23.58  14301.89        None         None
+16  20180831       24.06  14278.31        None         None
+17  20180824       23.12  14254.25        None         None
+18  20180817       23.04  14231.12        None         None
+19  20180810       23.96  14208.09        None         None
+20  20180803       24.22  14184.12        None         None
+```
+
+数据说明：从2017年2月10日开始，中国证券登记结算公司停止了发布本周持仓账户数和本周交易账户数；另外，2015年5月8日之前的数据结构也不同，具体请参阅股票开户旧数据接口。