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/指数成分和权重.md

@@ -0,0 +1,106 @@
+# 指数成分和权重
+
+**文档ID**: 96
+**原始链接**: https://tushare.pro/document/2?doc_id=96
+
+---
+
+## 指数成分和权重
+
+接口：index_weight描述：获取各类指数成分和权重，月度数据，建议输入参数里开始日期和结束日分别输入当月第一天和最后一天的日期。来源：指数公司网站公开数据积分：用户需要至少2000积分才可以调取，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>index_code</td>
+<td>str</td>
+<td>Y</td>
+<td>指数代码，来源<a href="https://tushare.pro/document/2?doc_id=94">指数基础信息接口</a></td>
+</tr>
+<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>None</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>描述</th>
+</tr>
+</thead>
+<tbody><tr>
+<td>index_code</td>
+<td>str</td>
+<td>指数代码</td>
+</tr>
+<tr>
+<td>con_code</td>
+<td>str</td>
+<td>成分代码</td>
+</tr>
+<tr>
+<td>trade_date</td>
+<td>str</td>
+<td>交易日期</td>
+</tr>
+<tr>
+<td>weight</td>
+<td>float</td>
+<td>权重</td>
+</tr>
+</tbody></table>
+接口调用
+
+```
+
+pro = ts.pro_api()
+
+#提取沪深300指数2018年9月成分和权重
+df = pro.index_weight(index_code='399300.SZ', start_date='20180901', end_date='20180930')
+
+```
+
+数据样例
+
+```
+    index_code   con_code trade_date  weight
+0    399300.SZ  000001.SZ   20180903  0.8656
+1    399300.SZ  000002.SZ   20180903  1.1330
+2    399300.SZ  000060.SZ   20180903  0.1125
+3    399300.SZ  000063.SZ   20180903  0.4273
+4    399300.SZ  000069.SZ   20180903  0.2010
+5    399300.SZ  000157.SZ   20180903  0.1699
+6    399300.SZ  000402.SZ   20180903  0.0816
+7    399300.SZ  000413.SZ   20180903  0.2023
+8    399300.SZ  000415.SZ   20180903  0.0648
+9    399300.SZ  000423.SZ   20180903  0.2100
+10   399300.SZ  000425.SZ   20180903  0.1884
+
+```