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/国债实际收益率曲线利率.md

@@ -0,0 +1,125 @@
+# 国债实际收益率曲线利率
+
+**文档ID**: 220
+**原始链接**: https://tushare.pro/document/2?doc_id=220
+
+---
+
+## 国债实际收益率曲线利率
+
+接口：us_trycr描述：国债实际收益率曲线利率限量：单次最大可获取2000行数据，可循环获取权限：用户积累120积分可以使用，积分越高频次越高。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>date</td>
+<td>str</td>
+<td>N</td>
+<td>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>
+<tr>
+<td>fields</td>
+<td>str</td>
+<td>N</td>
+<td>指定输出字段</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>date</td>
+<td>str</td>
+<td>Y</td>
+<td>日期</td>
+</tr>
+<tr>
+<td>y5</td>
+<td>float</td>
+<td>Y</td>
+<td>5年期</td>
+</tr>
+<tr>
+<td>y7</td>
+<td>float</td>
+<td>Y</td>
+<td>7年期</td>
+</tr>
+<tr>
+<td>y10</td>
+<td>float</td>
+<td>Y</td>
+<td>10年期</td>
+</tr>
+<tr>
+<td>y20</td>
+<td>float</td>
+<td>Y</td>
+<td>20年期</td>
+</tr>
+<tr>
+<td>y30</td>
+<td>float</td>
+<td>Y</td>
+<td>30年期</td>
+</tr>
+</tbody></table>
+接口调用
+
+```
+
+pro = ts.pro_api()
+
+df = pro.us_trycr(start_date='20180101', end_date='20200327')
+
+
+#获取5年期和20年期数据
+df = pro.us_trycr(start_date='20180101', end_date='20200327', fields='y5,y20')
+
+```
+
+数据样例
+
+```
+          date     y5     y7    y10    y20    y30
+0     20200327  -0.13  -0.20  -0.22  -0.12  -0.03
+1     20200326  -0.21  -0.24  -0.24  -0.14  -0.05
+2     20200325  -0.13  -0.18  -0.19  -0.09   0.00
+3     20200324  -0.03  -0.11  -0.13  -0.09  -0.07
+4     20200323   0.01  -0.03  -0.04  -0.02  -0.01
+...        ...    ...    ...    ...    ...    ...
+1995  20120404  -0.91  -0.46  -0.05   0.62   0.94
+1996  20120403  -0.94  -0.48  -0.06   0.62   0.94
+1997  20120402  -1.01  -0.55  -0.14   0.56   0.89
+1998  20120330  -0.98  -0.53  -0.09   0.61   0.93
+1999  20120329  -0.98  -0.53  -0.13   0.55   0.87
+```