Correct messages and docs that described things the library does not do

[mdfarhankc]

Summary

Wording and documentation fixes only. No behaviour changes.

• /register no longer claims to have sent a verification email. It answered "a verification email has been sent", but registration never emits send_verification_email, so users waited for mail that was not coming. It now says "If this email isn't already registered, the account has been created." The docs gain a recipe for sending one from the after_register hook.
• The auto-link refusal no longer points at a missing endpoint. It told users to link the provider "from account settings", which no route supports. The message is internal to OAuthProviderError; the HTTP response is unchanged.
• The Agent Skill described things that do not exist. It listed eight admin routes the library has never shipped, said admin routes accept require_role("admin") when they require a superuser, and described an OAuth callback that links through the caller's session.

Compatibility

The /register response text changes. Anything asserting on the old string needs updating; the status code and shape are the same.

Checks

ruff, ruff format, mypy --strict, pytest (514 passed, 9 skipped), mkdocs build --strict.

[coderabbitai]

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