feat: enable usage API by default

[Loongphy]

Summary

• enable ChatGPT usage API refresh by default for new and defaulted registry config
• show a warning in help, status, and list when usage is coming from the API
• document that users can switch to local-only usage reading with codex-auth config api disable, which is safer but less accurate

Validation

• zig test src/main.zig -lc
• HOME=/tmp/codex-auth-home ZIG_GLOBAL_CACHE_DIR=/tmp/zig-cache zig build run -- list

Notes

• default behavior now uses API-based usage queries unless the user explicitly disables it in config
• existing users who already set api.usage = false keep that setting; list/help/status do not flip it back on

Note

Enable API-based usage refresh by default in registry.ApiConfig

• Changes the default value of ApiConfig.usage in registry.zig from false to true, so new registries use API-only usage refresh out of the box.
• Adds cli.writeUsageApiRiskWarning and cli.printUsageApiRiskWarning in cli.zig to emit a bold-yellow warning to stderr when API usage is enabled, with guidance to disable via codex-auth config api disable.
• Wires the warning into help, status, and list commands in cli.zig, auto.zig, and main.zig respectively.
• Behavioral Change: existing users upgrading will now default to API-only usage refresh; the warning appears on stderr for all three commands whenever API usage is enabled.

^{Macroscope summarized 9afafc3.}

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commit: 9afafc3