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/北交所新旧代码对照.md

@@ -0,0 +1,92 @@
+# 北交所新旧代码对照
+
+**文档ID**: 375
+**原始链接**: https://tushare.pro/document/2?doc_id=375
+
+---
+
+## 北交所新旧代码对照表
+
+接口：bse_mapping描述：获取北交所股票代码变更后新旧代码映射表数据限量：单次最大1000条（本接口总数据量300以内）积分：120积分即可调取
+
+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>o_code</td>
+<td>str</td>
+<td>N</td>
+<td>旧代码</td>
+</tr>
+<tr>
+<td>n_code</td>
+<td>str</td>
+<td>N</td>
+<td>新代码</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>name</td>
+<td>str</td>
+<td>Y</td>
+<td>股票名称</td>
+</tr>
+<tr>
+<td>o_code</td>
+<td>str</td>
+<td>Y</td>
+<td>原代码</td>
+</tr>
+<tr>
+<td>n_code</td>
+<td>str</td>
+<td>Y</td>
+<td>新代码</td>
+</tr>
+<tr>
+<td>list_date</td>
+<td>str</td>
+<td>Y</td>
+<td>上市日期</td>
+</tr>
+</tbody></table>
+接口示例
+
+```
+
+#获取方大新材新旧代码对照数据
+df = pro.bse_mapping(o_code='838163.BJ')
+
+
+#获取全部变更的股票代码对照表
+df = pro.bse_mapping()
+
+
+```
+
+数据示例
+
+```
+      name     o_code   n_code    list_date
+0  方大新材  838163.BJ  920163.BJ  20200727
+
+```