fix(migrate): protect Oxc references and recover interrupted migrations

[fengmk2]

vp migrate can remove Oxc JSON configs that scripts or imported modules still use. Existing Vite+ projects can also retain unmerged configs after an interrupted migration.

The migrator now checks references before it merges configs or removes source files. It compares resolved paths and limits uncertain references to their workspace package. Retained JSON configs keep their inherited dependencies.

Case	Before	After
A script uses oxlint -c .oxlintrc.json, or a module imports an Oxc JSON config.	Migration can delete the file and break the consumer.	Migration keeps the referenced file.
Root and package configs have the same filename; only the root config has an external reference.	Migration can delete both files.	Migration keeps the root config and merges the independent package config.
Vite+ is installed, but unreferenced Oxc configs remain without a pending migration marker.	A regular migration leaves those configs outside vite.config.*.	Migration merges the remaining configs, including supported inheritance through shared TypeScript configs.
A script or module starts using retained JSON after a partial migration.	A retry can delete the file after it finds a completed migration marker.	A retry checks current references before it merges or removes files.

Recovery prepares inheritance graphs and references across the workspace before it removes any source files. It preserves existing inline config blocks and user edits to generated shared modules.

Supersedes #2695. Uses the inheritance conversion from #3097, which is now on main.

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