Further improved ThinkAuth(/infrastructure/thinkauth) sign-in speed, on top of July's stability fix — some sign-ins still occasionally took up to 30 seconds; they now answer in under a secon

Further improved ThinkAuth sign-in speed, on top of July's stability fix — some sign-ins still occasionally took up to 30 seconds; they now answer in under a second.

Imported from the 2026/08/01-2026/08/31 release.