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/基金净值.md

@@ -0,0 +1,145 @@
+# 基金净值
+
+**文档ID**: 119
+**原始链接**: https://tushare.pro/document/2?doc_id=119
+
+---
+
+## 公募基金净值
+
+接口：fund_nav，可以通过数据工具调试和查看数据。描述：获取公募基金净值数据积分：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>ts_code</td>
+<td>str</td>
+<td>N</td>
+<td>TS基金代码 （二选一）</td>
+</tr>
+<tr>
+<td>nav_date</td>
+<td>str</td>
+<td>N</td>
+<td>净值日期 （二选一）</td>
+</tr>
+<tr>
+<td>market</td>
+<td>str</td>
+<td>N</td>
+<td>E场内 O场外</td>
+</tr>
+<tr>
+<td>start_date</td>
+<td>str</td>
+<td>N</td>
+<td>净值开始日期</td>
+</tr>
+<tr>
+<td>end_date</td>
+<td>str</td>
+<td>N</td>
+<td>净值结束日期</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>ts_code</td>
+<td>str</td>
+<td>Y</td>
+<td>TS代码</td>
+</tr>
+<tr>
+<td>ann_date</td>
+<td>str</td>
+<td>Y</td>
+<td>公告日期</td>
+</tr>
+<tr>
+<td>nav_date</td>
+<td>str</td>
+<td>Y</td>
+<td>净值日期</td>
+</tr>
+<tr>
+<td>unit_nav</td>
+<td>float</td>
+<td>Y</td>
+<td>单位净值</td>
+</tr>
+<tr>
+<td>accum_nav</td>
+<td>float</td>
+<td>Y</td>
+<td>累计净值</td>
+</tr>
+<tr>
+<td>accum_div</td>
+<td>float</td>
+<td>Y</td>
+<td>累计分红</td>
+</tr>
+<tr>
+<td>net_asset</td>
+<td>float</td>
+<td>Y</td>
+<td>资产净值</td>
+</tr>
+<tr>
+<td>total_netasset</td>
+<td>float</td>
+<td>Y</td>
+<td>合计资产净值</td>
+</tr>
+<tr>
+<td>adj_nav</td>
+<td>float</td>
+<td>Y</td>
+<td>复权单位净值</td>
+</tr>
+</tbody></table>
+代码示例
+
+```
+
+pro = ts.pro_api()
+
+df = pro.fund_nav(ts_code='165509.SZ')
+
+```
+
+数据示例
+
+```
+        ts_code  ann_date  nav_date  unit_nav  accum_nav accum_div  \
+0     165509.SZ  20181019  20181018     1.104      1.587      None   
+1     165509.SZ  20181018  20181017     1.110      1.587      None   
+2     165509.SZ  20181017  20181016     1.110      1.587      None   
+3     165509.SZ  20181016  20181015     1.110      1.587      None   
+4     165509.SZ  20181013  20181012     1.110      1.587      None   
+5     165509.SZ  20181012  20181011     1.110      1.587      None   
+6     165509.SZ  20181011  20181010     1.110      1.587      None   
+7     165509.SZ  20181010  20181009     1.110      1.587      None   
+8     165509.SZ  20181009  20181008     1.109      1.586      None   
+9     165509.SZ  20180929  20180928     1.109      1.586      None   
+10    165509.SZ  20180928  20180927     1.109      1.586      None  
+```