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/券商月度金股.md

@@ -0,0 +1,91 @@
+# 券商月度金股
+
+**文档ID**: 267
+**原始链接**: https://tushare.pro/document/2?doc_id=267
+
+---
+
+## 券商每月荐股
+
+接口：broker_recommend描述：获取券商月度金股，一般1日~3日内更新当月数据限量：单次最大1000行数据，可循环提取积分：积分达到6000即可调用，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>month</td>
+<td>str</td>
+<td>Y</td>
+<td>月度（YYYYMM）</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>month</td>
+<td>str</td>
+<td>Y</td>
+<td>月度</td>
+</tr>
+<tr>
+<td>broker</td>
+<td>str</td>
+<td>Y</td>
+<td>券商</td>
+</tr>
+<tr>
+<td>ts_code</td>
+<td>str</td>
+<td>Y</td>
+<td>股票代码</td>
+</tr>
+<tr>
+<td>name</td>
+<td>str</td>
+<td>Y</td>
+<td>股票简称</td>
+</tr>
+</tbody></table>
+接口示例
+
+```
+
+#获取查询月份券商金股
+df = pro.broker_recommend(month='202106')
+
+```
+
+数据示例
+
+```
+             month broker    ts_code  name
+0    202106   东兴证券  000066.SZ  中国长城
+1    202106   东兴证券  000708.SZ  中信特钢
+2    202106   东兴证券  002304.SZ  洋河股份
+3    202106   东兴证券  003816.SZ  中国广核
+4    202106   东兴证券  300196.SZ  长海股份
+..      ...    ...        ...   ...
+263  202106   长城证券  600096.SH   云天化
+264  202106   长城证券  600809.SH  山西汾酒
+265  202106   长城证券  603596.SH   伯特利
+266  202106   长城证券  603885.SH  吉祥航空
+267  202106   长城证券  605068.SH  明新旭腾
+
+```