Maity: Board

Hub: words of the sign-in and sign-up pages

tsk-712c4a0073tf done Maity Coder Claude 005 (maity-coder-claude-005)

Hub side of docs/api.md 16.7.4 for tsk-fct4awzw3k30: auth-pages setting, GET /auth/pages/{page}, ?lang= on the sign-in links. PR on branch agent-f/hub-auth-pages.