Fixes#76872.
Doctor now repairs configured-but-missing official plugins during update/doctor recovery, auto-enables the plugin after a successful repair, and preserves config when the download cannot complete. The plugin auto-enable path also honors disabled web search and only enables configured providers/channels when a manifest declares the matching capability.
Verification:
- git diff --check
- fallback-only Korean i18n check
- focused plugin auto-enable/config/doctor Vitest suite
- Crabbox published upgrade-survivor configured-plugin-installs E2E
- CI green on PR head 67ba8ac002
Co-authored-by: Jack Storment <crazycoder131@gmail.com>
bdd68a75ea