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/ETF基准指数.md

@@ -0,0 +1,126 @@
+# ETF基准指数
+
+**文档ID**: 386
+**原始链接**: https://tushare.pro/document/2?doc_id=386
+
+---
+
+## ETF基准指数列表
+
+接口：etf_index描述：获取ETF基准指数列表信息限量：单次请求最大返回5000行数据（当前未超过2000个）权限：用户积累8000积分可调取，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>指数代码</td>
+</tr>
+<tr>
+<td>pub_date</td>
+<td>str</td>
+<td>N</td>
+<td>发布日期（格式：YYYYMMDD）</td>
+</tr>
+<tr>
+<td>base_date</td>
+<td>str</td>
+<td>N</td>
+<td>指数基期（格式：YYYYMMDD）</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>指数代码</td>
+</tr>
+<tr>
+<td>indx_name</td>
+<td>str</td>
+<td>Y</td>
+<td>指数全称</td>
+</tr>
+<tr>
+<td>indx_csname</td>
+<td>str</td>
+<td>Y</td>
+<td>指数简称</td>
+</tr>
+<tr>
+<td>pub_party_name</td>
+<td>str</td>
+<td>Y</td>
+<td>指数发布机构</td>
+</tr>
+<tr>
+<td>pub_date</td>
+<td>str</td>
+<td>Y</td>
+<td>指数发布日期</td>
+</tr>
+<tr>
+<td>base_date</td>
+<td>str</td>
+<td>Y</td>
+<td>指数基日</td>
+</tr>
+<tr>
+<td>bp</td>
+<td>float</td>
+<td>Y</td>
+<td>指数基点(点)</td>
+</tr>
+<tr>
+<td>adj_circle</td>
+<td>str</td>
+<td>Y</td>
+<td>指数成份证券调整周期</td>
+</tr>
+</tbody></table>
+接口示例
+
+```
+
+#获取当前ETF跟踪的基准指数列表
+df = pro.etf_index(fields='ts_code,indx_name,pub_date,bp')
+
+
+```
+
+数据示例
+
+```
+          ts_code        indx_name         pub_date           bp
+0        000068.SH         上证自然资源指数  20100528  1000.000000
+1        000001.SH           上证综合指数  19910715   100.000000
+2        000989.SH       中证全指可选消费指数  20110802  1000.000000
+3       000990.CSI       中证全指主要消费指数  20110802  1000.000000
+4        000043.SH         上证超级大盘指数  20090423  1000.000000
+...            ...              ...       ...          ...
+1458    932368.CSI     中证800自由现金流指数  20241211  1000.000000
+1460     000680.SH        上证科创板综合指数  20250120  1000.000000
+1461     000681.SH      上证科创板综合价格指数  20250120  1000.000000
+
+```