docs: credit Alibaba endpoint fix (#712)

Author: steipete

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Providers & Usage
 - Gemini: discover OAuth config in fnm/Homebrew/bundled CLI layouts so expired-token refresh keeps working (#723). Thanks @Leechael!
 - Copilot: open the complete device-login verification URL when available so the browser flow carries the user code (#739). Thanks @skhe!
+- Alibaba: update the China mainland Coding Plan endpoint and browser-cookie domain while keeping older domains as fallbacks (#712). Thanks @hezhongtang!
 
 ### Fixes
 - Keychain cache: preserve cached credentials when macOS temporarily denies keychain UI after wake, avoiding repeated prompts (#594). Thanks @josepe98!