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/metadata.json

@@ -0,0 +1,19 @@
+{
+  "name": "tushare-finance",
+  "version": "2.0.6",
+  "description": "获取中国金融市场数据（A股、港股、美股、基金、期货、债券）。支持220+个Tushare Pro接口：股票行情、财务报表、宏观经济指标。提供Python API客户端、命令行工具和批量导出功能。",
+  "author": "StanleyChanH",
+  "tags": ["金融数据", "A股", "港股", "美股", "量化", "股票", "基金", "期货", "Tushare", "财务数据", "宏观经济"],
+  "repository": "https://github.com/StanleyChanH/Tushare-Finance-Skill-for-Claude-Code",
+  "license": "Apache-2.0",
+  "dependencies": {
+    "python": ">=3.8",
+    "packages": ["tushare>=1.3.0", "pandas>=2.0.0", "openpyxl>=3.1.0"]
+  },
+  "openclaw": {
+    "requires": {
+      "bins": ["python3"],
+      "env": ["TUSHARE_TOKEN"]
+    }
+  }
+}