fix(rsc): align transform API types with Vite AST

[hi-ogawa]

This is a simpler and actually useful enough alternative of:

• refactor(rsc): use Vite ESTree types #1347

This tweaks transform utility input/output to be Vite 8 ESTree AST type, then immediately cast to old @types/estree type to preserve main transform logic as is.

It also removes the old @oxc-project/types path mapping and workspace @types/estree override, which was for Vite 7 / Rollup AST type era workaround.