feat(embedded): add /e/authorize email OTP flow

[pmathew92]

Summary

• Adds EmbeddedAuthClient with the full multi-step embedded /e/authorize flow: authorize, identifyEmail, identifyPhone, challengeEmail, verifyOtp
• Implements the continuation-as-error model — non-terminal steps complete through EmbeddedAuthException carrying a rotated auth_session and nextActions; verifyOtp is the terminal step that yields Credentials
• Fixes scope omission: authorize() now accepts scope (default "openid profile email offline_access") and optional audience so the token exchange returns an id_token
• Converts authorizeUrl to a lazy property to avoid recomputing the URL on every step

[coderabbitai]

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