scalability: create unified auth API service
- Updated apps/web/src/services/api/auth.ts to export unified authApi object
- Wraps core auth functions: login, register, logout, getMe (with token storage logic)
- Wraps token management: refresh
- Wraps email verification: verifyEmail, resendVerification
- Wraps password management: requestPasswordReset, resetPassword
- Wraps username checking: checkUsername
- Wraps OAuth methods: getOAuthProviders, initiateOAuth
- Wraps 2FA methods: setup2FA, verify2FA, disable2FA, get2FAStatus
- Re-exports all related types for convenience
- Updated services/api/index.ts to export authApi
- No TypeScript errors
- Follows existing service layer pattern (similar to tracks.ts, users.ts, playlists.ts)
- Preserves existing token storage logic in login/register/logout
- Action 6.1.1.5 complete
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