docs: sync zh README star-history chart to dera.page mirror (#3354)

The English README migrated the star-history chart/link from
star-history.com / api.star-history.com to star-history.dera.page,
but README.zh.md (last synced at d229a9b) still used the old domains.
Update the 4 URLs so both language versions stay consistent.

README.zh.md

@@ -87,11 +87,11 @@
 </p>
 
 <p align="center">
-  <a href="https://star-history.com/#ultraworkers/claw-code&Date">
+  <a href="https://star-history.dera.page/#ultraworkers/claw-code&Date">
     <picture>
-      <source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/svg?repos=ultraworkers/claw-code&type=Date&theme=dark" />
+      <source media="(prefers-color-scheme: dark)" srcset="https://star-history.dera.page/svg?repos=ultraworkers/claw-code&type=Date&theme=dark" />
-      <source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/svg?repos=ultraworkers/claw-code&type=Date" />
+      <source media="(prefers-color-scheme: light)" srcset="https://star-history.dera.page/svg?repos=ultraworkers/claw-code&type=Date" />
-      <img alt="Star history for ultraworkers/claw-code" src="https://api.star-history.com/svg?repos=ultraworkers/claw-code&type=Date" width="600" />
+      <img alt="Star history for ultraworkers/claw-code" src="https://star-history.dera.page/svg?repos=ultraworkers/claw-code&type=Date" width="600" />
     </picture>
   </a>
 </p>