Complete rewrites of the user-controlled wallet quickstarts for Social
Login, Email OTP, and PIN to improve clarity, consistency, and
developer usability. The new quickstarts emphasize building a runnable
end-to-end app that demonstrates authentication, wallet creation, and onchain
actions. Backend routes were restructured to clearly map frontend actions to the
corresponding Circle API endpoints. The updates make the wallet lifecycle, SDK
usage, and backend integration patterns more explicit and easier to follow for
first-time integrators.The following topics were updated and renamed:
