feat: Add API key support

[Loongphy]

Summary

Support OPENAI_API_KEY auth as a first-class managed account.

This change:

• imports and syncs API-key auth.json files instead of rejecting them with MissingEmail
• resolves API-key identity via GET /v1/me
• stores the account email for list display and grouping
• uses API_KEY in the PLAN column for API-key accounts
• keeps single API-key rows email-only, and shows masked per-key child labels when the same email has multiple API keys
• skips ChatGPT usage refresh for registry records marked as API-key auth, so stale or malformed API-key snapshots render placeholder usage instead of MissingAuth

API key identity

For API-key auth, the local account_key now uses:

apikey::<me.id>::<sha256(OPENAI_API_KEY)>

list example

Single API key account:

     ACCOUNT           PLAN      5H USAGE  WEEKLY USAGE  LAST ACTIVITY
---------------------------------------------------------------------
user@example.com      API_KEY        -           -            -

Multiple API keys for the same email:

     ACCOUNT           PLAN      5H USAGE  WEEKLY USAGE  LAST ACTIVITY
---------------------------------------------------------------------
user@example.com
  sk-7f3c1***42ce     API_KEY        -           -            -

Validation

• HOME=/tmp/codex-auth-pr93-check zig build --build-file /coding/codex-auth/build.zig --cache-dir /tmp/codex-auth-pr93-check/zig-cache --global-cache-dir /tmp/codex-auth-pr93-check/zig-global-cache test
• HOME=/tmp/codex-auth-pr93-run CODEX_HOME=/tmp/codex-auth-pr93-run/.codex zig build --build-file /coding/codex-auth/build.zig --cache-dir /tmp/codex-auth-pr93-run/zig-cache --global-cache-dir /tmp/codex-auth-pr93-run/zig-global-cache run -- list
• Manual reproduction: API-key registry record with stale {} snapshot now renders API_KEY with - usage, not MissingAuth

Refs #92
Issue: #92

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commit: 0e18634