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/历史Tick行情.md

@@ -0,0 +1,126 @@
+# 历史Tick行情
+
+**文档ID**: 314
+**原始链接**: https://tushare.pro/document/2?doc_id=314
+
+---
+
+## 期货Tick行情数据
+
+获取全市场期货合约的Tick高频行情，当前不提供API方式获取，只提供csv网盘交付，近10年历史数据，一次性网盘拷贝（支持按交易所按日期定制），每天增量更新。tick行情属于单独的数据服务内容，不在积分权限范畴，有需求的用户请微信联系：waditu_a ，联系时请注明期货tick数据。
+
+数据字段内容说明
+
+<table>
+<thead>
+<tr>
+<th>字段</th>
+<th>类型</th>
+<th>中文含义</th>
+<th>样例</th>
+</tr>
+</thead>
+<tbody><tr>
+<td>InstrumentID</td>
+<td>string</td>
+<td>合约ID</td>
+<td>cu2310</td>
+</tr>
+<tr>
+<td>BidPrice1</td>
+<td>float</td>
+<td>买一价</td>
+<td>68190.000000</td>
+</tr>
+<tr>
+<td>BidVolume1</td>
+<td>int</td>
+<td>买一量</td>
+<td>4</td>
+</tr>
+<tr>
+<td>AskPrice1</td>
+<td>float</td>
+<td>卖一价</td>
+<td>68212.000000</td>
+</tr>
+<tr>
+<td>AskVolume1</td>
+<td>int</td>
+<td>卖一量</td>
+<td>2</td>
+</tr>
+<tr>
+<td>LastPrice</td>
+<td>float</td>
+<td>最新价</td>
+<td>68210.000000</td>
+</tr>
+<tr>
+<td>Volume</td>
+<td>int</td>
+<td>成交量</td>
+<td>3223</td>
+</tr>
+<tr>
+<td>Turnover</td>
+<td>float</td>
+<td>成交金额</td>
+<td>382577245.000000</td>
+</tr>
+<tr>
+<td>OpenInterest</td>
+<td>int</td>
+<td>持仓量</td>
+<td>203332.000000</td>
+</tr>
+<tr>
+<td>UpperLimitPrice</td>
+<td>float</td>
+<td>涨停价</td>
+<td>68210.000000</td>
+</tr>
+<tr>
+<td>LowerLimitPrice</td>
+<td>float</td>
+<td>跌停价</td>
+<td>62210.000000</td>
+</tr>
+<tr>
+<td>OpenPrice</td>
+<td>float</td>
+<td>今开盘</td>
+<td>68010.000000</td>
+</tr>
+<tr>
+<td>PreSettlementPrice</td>
+<td>float</td>
+<td>昨结算价</td>
+<td>68110.000000</td>
+</tr>
+<tr>
+<td>PreClosePrice</td>
+<td>float</td>
+<td>昨收盘价</td>
+<td>68113.000000</td>
+</tr>
+<tr>
+<td>PreOpenInterest</td>
+<td>int</td>
+<td>昨持仓量</td>
+<td>3232343.000000</td>
+</tr>
+<tr>
+<td>TradingDay</td>
+<td>string</td>
+<td>交易日期</td>
+<td>20230925</td>
+</tr>
+<tr>
+<td>UpdateTime</td>
+<td>string</td>
+<td>更新时间</td>
+<td>10:00:00.500</td>
+</tr>
+</tbody></table>
+文件样例