fix(sync): refresh catalog for side profiles when Codex injection is OFF

[harryzhou2000]

Explicit ocx sync (and ocx sync-cache) now refresh the catalog and models cache even when the Codex integration toggle is OFF or an external model_provider owns config.toml.

Rationale: users may consume the OpenCodex catalog through a custom side profile without injection. The refresh is harmless in those modes because config, journal, and history are never touched (new catalog-only sync status). POST /api/sync, startup, and ensure keep the existing OFF skip.

Tests: unit tests for the catalog-only and external-provider paths, models-cache override test, and updated composed-acceptance coverage.

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