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/股票曾用名.md

@@ -0,0 +1,110 @@
+# 股票曾用名
+
+**文档ID**: 100
+**原始链接**: https://tushare.pro/document/2?doc_id=100
+
+---
+
+## 股票曾用名
+
+接口：namechange描述：历史名称变更记录
+
+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代码</td>
+</tr>
+<tr>
+<td>start_date</td>
+<td>str</td>
+<td>N</td>
+<td>公告开始日期</td>
+</tr>
+<tr>
+<td>end_date</td>
+<td>str</td>
+<td>N</td>
+<td>公告结束日期</td>
+</tr>
+</tbody></table>
+输出参数
+
+<table>
+<thead>
+<tr>
+<th>名称</th>
+<th>类型</th>
+<th>默认输出</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>name</td>
+<td>str</td>
+<td>Y</td>
+<td>证券名称</td>
+</tr>
+<tr>
+<td>start_date</td>
+<td>str</td>
+<td>Y</td>
+<td>开始日期</td>
+</tr>
+<tr>
+<td>end_date</td>
+<td>str</td>
+<td>Y</td>
+<td>结束日期</td>
+</tr>
+<tr>
+<td>ann_date</td>
+<td>str</td>
+<td>Y</td>
+<td>公告日期</td>
+</tr>
+<tr>
+<td>change_reason</td>
+<td>str</td>
+<td>Y</td>
+<td>变更原因</td>
+</tr>
+</tbody></table>
+接口示例
+
+```
+
+pro = ts.pro_api()
+
+df = pro.namechange(ts_code='600848.SH', fields='ts_code,name,start_date,end_date,change_reason')
+
+```
+
+数据样例
+
+```
+    ts_code    name    start_date   end_date      change_reason
+0  600848.SH   上海临港   20151118      None         改名
+1  600848.SH   自仪股份   20070514  20151117         撤销ST
+2  600848.SH   ST自仪     20061026  20070513         完成股改
+3  600848.SH   SST自仪   20061009  20061025        未股改加S
+4  600848.SH   ST自仪     20010508  20061008         ST
+5  600848.SH   自仪股份  19940324  20010507         其他
+```