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/美股交易日历.md

@@ -0,0 +1,102 @@
+# 美股交易日历
+
+**文档ID**: 253
+**原始链接**: https://tushare.pro/document/2?doc_id=253
+
+---
+
+## 美股交易日历
+
+接口：us_tradecal描述：获取美股交易日历信息限量：单次最大6000，可根据日期阶段获取
+
+输入参数
+
+<table>
+<thead>
+<tr>
+<th>名称</th>
+<th>类型</th>
+<th>必选</th>
+<th>描述</th>
+<th>示例</th>
+</tr>
+</thead>
+<tbody><tr>
+<td>start_date</td>
+<td>str</td>
+<td>N</td>
+<td>开始日期</td>
+<td>20200101</td>
+</tr>
+<tr>
+<td>end_date</td>
+<td>str</td>
+<td>N</td>
+<td>结束日期</td>
+<td>20200701</td>
+</tr>
+<tr>
+<td>is_open</td>
+<td>str</td>
+<td>N</td>
+<td>是否交易</td>
+<td>0：休市 、1：交易</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>cal_date</td>
+<td>str</td>
+<td>Y</td>
+<td>日历日期</td>
+</tr>
+<tr>
+<td>is_open</td>
+<td>int</td>
+<td>Y</td>
+<td>是否交易 '0'休市 '1'交易</td>
+</tr>
+<tr>
+<td>pretrade_date</td>
+<td>str</td>
+<td>Y</td>
+<td>上一个交易日</td>
+</tr>
+</tbody></table>
+接口示例
+
+```
+
+pro = ts.pro_api()
+
+df = pro.us_tradecal(start_date='20200101', end_date='20200701')
+
+
+```
+
+数据示例
+
+```
+     cal_date  is_open pretrade_date
+0    20200701        1      20200630
+1    20200630        1      20200629
+2    20200629        1      20200626
+3    20200628        0      20200625
+4    20200627        0      20200625
+..        ...      ...           ...
+178  20200105        0      20200102
+179  20200104        0      20200102
+180  20200103        1      20200102
+181  20200102        1      20191231
+182  20200101        0      20191230
+```