fix(codex): always update model catalog JSON on provider switch (#3360)

* fix(codex): always update model catalog JSON on provider switch

Without this fix, the cc-switch-model-catalog.json file and the
model_catalog_json field in config.toml were only regenerated when
should_sync_backup was true (proxy active or backup exists). Switching
providers while the proxy was idle left the catalog pointing at the
previous provider's models, requiring a full restart to take effect.

After the existing should_sync_backup block, unconditionally call
write_codex_provider_live_with_catalog when switching a Codex provider
and the proxy is not currently active (live_taken_over == false). This
mirrors what live.rs already does during a normal provider apply.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix(codex): refresh catalog on restored hot switch

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Co-authored-by: yueqi.guo <guo_yueqi@qq.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Jason <farion1231@gmail.com>