Major cleanup of the config system after migrating settings from `.npmrc` to `pnpm-workspace.yaml`.
### Config reader simplification
- Remove `checkUnknownSetting` (dead code, always `false`)
- Trim `npmConfigTypes` from ~127 to ~67 keys (remove unused npm config keys)
- Replace `rcOptions` iteration over all type keys with direct construction from defaults + auth overlay
- Remove `rcOptionsTypes` parameter from `getConfig()` and its assembly chain
### Rename `rawConfig` to `authConfig`
- `rawConfig` was a confusing mix of auth data and general settings
- Non-auth settings are already on the typed `Config` object — stop duplicating them in `rawConfig`
- Rename `rawConfig` → `authConfig` across the codebase to clarify it only contains auth/registry data from `.npmrc`
### Remove `rawConfig` from non-auth consumers
- **Lifecycle hooks**: replace `rawConfig: object` with `userAgent?: string` — only user-agent was read
- **Fetchers**: remove unused `rawConfig` from git fetcher, binary fetcher, tarball fetcher, prepare-package
- **Update command**: use `opts.production/dev/optional` instead of `rawConfig.*`
- **`pnpm init`**: accept typed init properties instead of parsing `rawConfig`
### Add `nodeDownloadMirrors` setting
- New `nodeDownloadMirrors?: Record<string, string>` on `PnpmSettings` and `Config`
- Replaces the `node-mirror:<channel>` pattern that was stored in `rawConfig`
- Configured in `pnpm-workspace.yaml`:
```yaml
nodeDownloadMirrors:
release: https://my-mirror.example.com/download/release/
```
- Remove unused `rawConfig` from deno-resolver and bun-resolver
### Refactor `pnpm config get/list`
- New `configToRecord()` builds display data from typed Config properties on the fly
- Excludes sensitive internals (`authInfos`, `sslConfigs`, etc.)
- Non-types keys (e.g., `package-extensions`) resolve through `configToRecord` instead of direct property access
- Delete `processConfig.ts` (replaced by `configToRecord.ts`)
### Pre-push hook improvement
- Add `compile-only` (`tsgo --build`) to pre-push hook to catch type errors before push
