RobinTail / express-zod-api / 31299819357

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Using TypeScript 7 for checks and DTS (#3545)

- TS 7 (tsgo) is installed under the name `@typescript/native-preview`
which matches both:
- [the official recommendation on dual installation
approach](https://devblogs.microsoft.com/typescript/announcing-typescript-7-0/#running-side-by-side-with-typescript-6.0)
- and [the expectations of `rolldown-plugin-dts` for `tsgo`
generator](https://github.com/sxzz/rolldown-plugin-dts/blob/9c2aaaa9c/README.md#generators)
- It can be used for `pretest: tsc` and there is an experimental support
by `tsdown`
- the redundant `.d.ts` files for tools had to be addressed by adding
specific `tsconfig.build.json` files that contain an explicit `include`
entry for the files involved into build process only;
- the cross-workspace import that ensures the constraint of the
`brandProperty` equality has to be addressed by making a dedicated
entrypoint for `brand.ts` having no side effects, otherwise it creates a
redundant dts file in sources as well.
- the public API is officially missing, but in fact it's just under
`unstable` dir — experimenting with it in #3549

| Performance, Node 26.x | TS 6 | TS 7 |
|--------|--------|--------|
| Build | 10s | 7s |
| Test | 33s | 23s | 

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

## Summary by CodeRabbit

- **New Features**
- Added a public `brand` entry point for importing branding-related
functionality.
- Improved TypeScript declaration generation across supported packages.

- **Refactor**
- Updated build configuration for clearer source and declaration
outputs.
- Standardized development tooling with the native TypeScript
implementation.
- Refined compilation and type-checking scopes for more reliable builds.
  - Improved module resolution for branding-related types.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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