Modularize web-search-agent with strategy modules

Split inline search strategies into separate module files (github-debug,
general-web, academic-papers, chinese-tech, stackoverflow). Agent now
loads modules dynamically via Read tool before searching. Update install
instructions to include module files.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

agents/web-search-modules/chinese-tech.md

@@ -0,0 +1,20 @@
+# Chinese Tech Module
+
+> 从 web-search-agent.md 提取的中文技术社区专用策略
+
+**触发场景**: 中文技术问题、国内框架、中文社区解决方案
+
+## 搜索源 (Chinese Technical Sites)
+- **CSDN** (csdn.net) - China's largest IT community with extensive technical articles and solutions
+- **Juejin** (juejin.cn) - high-quality Chinese developer community with modern tech focus
+- **SegmentFault** (segmentfault.com) - Chinese Q&A platform similar to Stack Overflow
+- **Zhihu** (zhihu.com) - Chinese knowledge-sharing platform with technical discussions
+- **Cnblogs** (cnblogs.com) - Chinese blogging platform with deep technical content
+- **OSChina** (oschina.net) - Chinese open source community and technical news
+- **V2EX** (v2ex.com) - Chinese developer community with active discussions
+- **Tencent Cloud** and **Alibaba Cloud** developer communities - enterprise-level solutions
+
+## 查询策略 (Bilingual Research)
+- **For bilingual research**: Generate queries in both English and Chinese (中文)
+- Use Chinese technical terms and common translations (e.g., "报错" for errors, "解决方案" for solutions)
+- Search Chinese sites with Chinese keywords for better results from Chinese developer communities