feat: add model favorites sync setting

[iHildy]

Added model favorites sync based on the CLI/TUI state file, and made it enabled by default. The plugin now includes ~/.local/state/opencode/model.json (or XDG/Windows equivalents) in the sync plan unless explicitly disabled.

• New config flag includeModelFavorites (default true) wired through normalization and init options in src/sync/config.ts and src/sync/service.ts
• Sync plan now includes the state file at state/model.json in the repo when enabled in src/sync/paths.ts
• Tool schema exposes includeModelFavorites for /sync-init in src/index.ts
• Status output shows Model favorites: enabled/disabled in src/sync/service.ts
• Docs updated: config example + synced paths list in README.md, and init command guidance in src/command/sync-init.md
• Tests added for default/disable behavior in src/sync/paths.test.ts and default normalization in src/sync/config.test.ts
  If you want to disable it later, set "includeModelFavorites": false in ~/.config/opencode/opencode-synced.jsonc (or pass includeModelFavorites=false to /sync-init).

[gemini-code-assist]

Summary of Changes

Hello @iHildy, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces the capability to synchronize user-defined model favorites, stored in a dedicated state file, across different environments. By making this feature enabled by default, it ensures a consistent user experience for model management. The changes involve extending the existing synchronization framework to recognize and manage this new data type, along with providing clear configuration options for users who wish to customize its behavior.

Highlights

• New Configuration Option: Introduced a new configuration option, "includeModelFavorites", to control the synchronization of model favorites, which is enabled by default.
• Model Favorites File Integration: Integrated the ~/.local/state/opencode/model.json file into the synchronization plan, ensuring model favorites are synced across environments.
• Tool Schema and Status Output Updates: Updated the /sync-init tool schema to expose the includeModelFavorites option and enhanced the sync status output to display whether model favorites synchronization is enabled or disabled.
• Documentation Updates: Updated documentation in README.md and src/command/sync-init.md to reflect the new feature and its configuration.
• Comprehensive Testing: Added comprehensive unit tests to validate the default behavior and explicit disabling of model favorites synchronization.

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[gemini-code-assist]

Code Review

This pull request introduces a new feature to sync model favorites, which is enabled by default. The changes are well-implemented across the configuration, sync logic, API, and documentation. New tests have been added to cover the default and disabled states of the new feature, ensuring its correctness. The code quality is high, with clear logic for handling the new configuration flag. Overall, this is an excellent contribution that is ready for merging.