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/转融资交易汇总.md

@@ -0,0 +1,119 @@
+# 转融资交易汇总
+
+**文档ID**: 331
+**原始链接**: https://tushare.pro/document/2?doc_id=331
+
+---
+
+## 转融资交易汇总
+
+接口：slb_len描述：转融通融资汇总限量：单次最大可以提取5000行数据，可循环获取所有历史积分：2000积分每分钟请求200次，5000积分500次请求
+
+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>trade_date</td>
+<td>str</td>
+<td>N</td>
+<td>交易日期（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>
+</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>trade_date</td>
+<td>str</td>
+<td>Y</td>
+<td>交易日期</td>
+</tr>
+<tr>
+<td>ob</td>
+<td>float</td>
+<td>Y</td>
+<td>期初余额(亿元)</td>
+</tr>
+<tr>
+<td>auc_amount</td>
+<td>float</td>
+<td>Y</td>
+<td>竞价成交金额(亿元)</td>
+</tr>
+<tr>
+<td>repo_amount</td>
+<td>float</td>
+<td>Y</td>
+<td>再借成交金额(亿元)</td>
+</tr>
+<tr>
+<td>repay_amount</td>
+<td>float</td>
+<td>Y</td>
+<td>偿还金额(亿元)</td>
+</tr>
+<tr>
+<td>cb</td>
+<td>float</td>
+<td>Y</td>
+<td>期末余额(亿元)</td>
+</tr>
+</tbody></table>
+接口示例
+
+```
+
+pro = ts.pro_api()
+
+df = pro.slb_len(start_date='20240601', end_date='20240620')
+
+
+```
+
+数据示例
+
+```
+     trade_date    ob auc_amount repo_amount repay_amount     cb
+0    20240620  1435.50       None        3.10         3.10  1435.50
+1    20240619  1435.50       None        2.70         2.70  1435.50
+2    20240618  1440.20       None       29.50        34.20  1435.50
+3    20240617  1442.20       None        3.00         5.00  1440.20
+4    20240614  1442.20       None        None         None  1442.20
+5    20240613  1445.20       None        2.90         5.90  1442.20
+6    20240612  1445.20       None        3.30         3.30  1445.20
+7    20240611  1454.20       None        2.70        11.70  1445.20
+8    20240607  1454.20       None        None         None  1454.20
+9    20240606  1454.20       None       26.00        26.00  1454.20
+10   20240605  1455.60       None        6.00         7.40  1454.20
+11   20240604  1406.00      50.00        6.40         6.80  1455.60
+12   20240603  1406.00       None        1.00         1.00  1406.00
+
+```