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/融资融券交易汇总.md

@@ -0,0 +1,139 @@
+# 融资融券交易汇总
+
+**文档ID**: 58
+**原始链接**: https://tushare.pro/document/2?doc_id=58
+
+---
+
+## 融资融券交易汇总
+
+接口：margin描述：获取融资融券每日交易汇总数据限量：单次请求最大返回4000行数据，可根据日期循环权限：2000积分可获得本接口权限，积分越高权限越大，具体参考权限说明
+
+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>trade_date</td>
+<td>str</td>
+<td>N</td>
+<td>交易日期（格式：YYYYMMDD，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>
+<tr>
+<td>exchange_id</td>
+<td>str</td>
+<td>N</td>
+<td>交易所代码（SSE上交所SZSE深交所BSE北交所）</td>
+</tr>
+</tbody></table>
+输出参数
+
+<table>
+<thead>
+<tr>
+<th>名称</th>
+<th>类型</th>
+<th>描述</th>
+</tr>
+</thead>
+<tbody><tr>
+<td>trade_date</td>
+<td>str</td>
+<td>交易日期</td>
+</tr>
+<tr>
+<td>exchange_id</td>
+<td>str</td>
+<td>交易所代码（SSE上交所SZSE深交所BSE北交所）</td>
+</tr>
+<tr>
+<td>rzye</td>
+<td>float</td>
+<td>融资余额(元)</td>
+</tr>
+<tr>
+<td>rzmre</td>
+<td>float</td>
+<td>融资买入额(元)</td>
+</tr>
+<tr>
+<td>rzche</td>
+<td>float</td>
+<td>融资偿还额(元)</td>
+</tr>
+<tr>
+<td>rqye</td>
+<td>float</td>
+<td>融券余额(元)</td>
+</tr>
+<tr>
+<td>rqmcl</td>
+<td>float</td>
+<td>融券卖出量(股,份,手)</td>
+</tr>
+<tr>
+<td>rzrqye</td>
+<td>float</td>
+<td>融资融券余额(元)</td>
+</tr>
+<tr>
+<td>rqyl</td>
+<td>float</td>
+<td>融券余量(股,份,手)</td>
+</tr>
+</tbody></table>
+接口使用
+
+```
+
+pro = ts.pro_api()
+
+df = pro.margin(trade_date='20180802')
+
+```
+
+或者
+
+```
+
+df = pro.query('margin', trade_date='20180802', exchange_id='SSE')
+
+```
+
+数据样例
+
+```
+  trade_date exchange_id          rzye         rzmre         rzche  \
+0   20180802        SZSE  3.495054e+11  1.347549e+10  1.463921e+10   
+1   20180802         SSE  5.311746e+11  1.484584e+10  1.573947e+10   
+
+           rqye       rqmcl        rzrqye  
+0  1.083380e+09  24418046.0  3.505888e+11  
+1  6.029618e+09  83721012.0  5.372042e+11  
+
+```
+
+说明融资融券数据从证券交易所网站直接获取，提供了有记录以来的全部汇总和明细数据。根据交所网站提示：数据根据券商申报的数据汇总，由券商保证数据的真实、完整、准确。
+
+其中：本日融资余额(元)=前日融资余额＋本日融资买入-本日融资偿还额本日融券余量(股)=前日融券余量＋本日融券卖出量-本日融券买入量-本日现券偿还量本日融券余额(元)=本日融券余量×本日收盘价本日融资融券余额(元)=本日融资余额＋本日融券余额
+
+2014年9月22日起，“融资融券交易总量”数据包含调出标的证券名单的证券的融资融券余额