Remove the 874-line hand-written oxlint-config.ts and import OxlintConfig
directly from the oxlint package, which already exports the same type.
Clean up related lint overrides and typos exclusions for the deleted file.

oxlint's TypeScript checker (tsgolint) does not support baseUrl in
tsconfig.json, causing lint failures after migration. Guard both
migration and lint --init paths to omit typeAware/typeCheck defaults
when baseUrl is present.

When tsconfig.json has baseUrl and we skip injecting typeAware/typeCheck,
log a warning with actionable advice to run `npx @andrewbranch/ts5to6
--fixBaseUrl .` to remove baseUrl. Added warning in both migration and
lint --init paths. Updated snap test fixture with .oxlintrc.json to
capture the warning output.

…hed package

The static import of init-config.js in bin.ts transitively loads
detect-indent (a devDependency), causing ERR_MODULE_NOT_FOUND when
vite-plus is installed as a dependency. Change to dynamic import so
it's only loaded for local commands that actually need it.

Fixes frm-stack E2E test failure.

…t-indent dependency chain

Move hasBaseUrlInTsconfig from utils/json.ts (which imports detect-indent)
to a new utils/tsconfig.ts that uses only Node.js builtins. This breaks the
transitive dependency chain from init-config.ts → json.ts → detect-indent,
allowing detect-indent/detect-newline to remain devDependencies since they
are only used by rolldown-bundled global CLI code.