Support phone login auth organization accounts

[mituyang]

Summary

• Support phone-login auth files that omit legacy account id fields by falling back to JWT organizations[].id.
• Document the ChatGPT account context priority: tokens.account_id, JWT chatgpt_account_id, then default/first JWT organizations[].id.
• Clarify that organization fallback stores an org-... context in chatgpt_account_id and record_key when legacy ids are absent.
• Add coverage for organization-based auth parsing.

Validation

• HOME=/tmp/codex-auth-pr100-list zig build run -- list
• HOME=/tmp/codex-auth-pr100-test zig build test
• Manual directory import reproduction passed without MissingAccountId or allocator leaks.

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commit: f4b71b0