docs(readme): link Claude Code section

Link the English and Chinese README Claude Code headings to the official Claude Code repository so readers can jump directly to the integration target.

Validation: documentation-only change; CI build-and-test (1.24) passed.

Author: Grivn

README.md

@@ -84,7 +84,7 @@ make install
 mnemon --version
 ```
 
-### Claude Code
+### [Claude Code](https://github.com/anthropics/claude-code)
 
 ```bash
 mnemon setup

docs/zh/README.md

@@ -84,7 +84,7 @@ make install
 mnemon --version
 ```
 
-### Claude Code
+### [Claude Code](https://github.com/anthropics/claude-code)
 
 ```bash
 mnemon setup