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/中央结算系统持股统计.md

@@ -0,0 +1,129 @@
+# 中央结算系统持股统计
+
+**文档ID**: 295
+**原始链接**: https://tushare.pro/document/2?doc_id=295
+
+---
+
+## 中央结算系统持股汇总
+
+接口：ccass_hold描述：获取中央结算系统持股汇总数据，覆盖全部历史数据，根据交易所披露时间，当日数据在下一交易日早上9点前完成入库限量：单次最大5000条数据，可循环或分页提供全部积分：用户120积分可以试用看数据，5000积分每分钟可以请求300次，8000积分以上可以请求500次每分钟，具体请参阅积分获取办法
+
+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>ts_code</td>
+<td>str</td>
+<td>N</td>
+<td>股票代码 (e.g. 605009.SH)</td>
+</tr>
+<tr>
+<td>hk_code</td>
+<td>str</td>
+<td>N</td>
+<td>港交所代码 （e.g. 95009）</td>
+</tr>
+<tr>
+<td>trade_date</td>
+<td>str</td>
+<td>N</td>
+<td>交易日期(YYYYMMDD格式，下同)</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>trade_date</td>
+<td>str</td>
+<td>Y</td>
+<td>交易日期</td>
+</tr>
+<tr>
+<td>ts_code</td>
+<td>str</td>
+<td>Y</td>
+<td>股票代号</td>
+</tr>
+<tr>
+<td>name</td>
+<td>str</td>
+<td>Y</td>
+<td>股票名称</td>
+</tr>
+<tr>
+<td>shareholding</td>
+<td>str</td>
+<td>Y</td>
+<td>于中央结算系统的持股量(股)<br/>Shareholding in CCASS</td>
+</tr>
+<tr>
+<td>hold_nums</td>
+<td>str</td>
+<td>Y</td>
+<td>参与者数目（个）</td>
+</tr>
+<tr>
+<td>hold_ratio</td>
+<td>str</td>
+<td>Y</td>
+<td>占于上交所上市及交易的A股总数的百分比（%）<br/>% of the total number of A shares listed and traded on the SSE</td>
+</tr>
+</tbody></table>
+Note:
+
+- The total number of A shares listed and traded on the SSE of the relevant SSE-listed company used for calculating the percentage of shareholding may not have taken into account any change in connection with or as a result of any corporate actions of the relevant company and hence, may not be up-to-date. The percentage of shareholding is for reference only.
+
+- The total number of A shares listed and traded on the SSE of the relevant SSE-listed company used for calculating the percentage of shareholding may not be equal to the actual total number of issued shares of that company.
+
+
+接口用法
+
+```
+
+pro = ts.pro_api()
+
+df = pro.ccass_hold(ts_code='00960.HK')
+
+```
+
+数据样例
+
+```
+    trade_date   ts_code  name       shareholding hold_nums hold_ratio
+0     20220519  00960.HK  龍湖集團   4576163843       182      75.30
+1     20220518  00960.HK  龍湖集團   4576043843       182      75.30
+2     20220517  00960.HK  龍湖集團   4575955343       180      75.30
+3     20220516  00960.HK  龍湖集團   4575905343       179      75.30
+4     20220513  00960.HK  龍湖集團   4575905343       181      75.30
+
+```