Implement cluster content migration and local versions override. Adds a new IPC API (copy_cluster_content) and CopyClusterResult, plus copy_dir_all helper to recursively copy files. Introduces migrate_non_bundle_packages and migrate_bundles_to_cluster to map and install provider-managed packages for the target MC version and to translate/copy bundle overrides; files without a compatible provider version are copied as .disabled and returned to the caller. Prefer a local versions_override.json when loading the online manifest (useful for testing) and adapt MC version parsing/formatting for year-based majors. Frontend: update generated bindings/types, add MigrationModal UI and useVersionMigration hook, integrate the migration modal into the root and debug screens, and persist seen_versions in settings. Misc: propagate manifest/versions into several UI routes and adjust bundle/package handling accordingly.
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