Fix README inaccuracies in prerequisites and build order

[Copilot]

README had incorrect prerequisite groupings and inconsistent ordering between build and test sections.

Changes

• Prerequisites: Reorganized by language target

  • TypeScript: Only Emscripten SDK (no CMake/compiler needed)
  • Python: Python 3.10-3.14, C++20 compiler, CMake 3.30+
  • C++: C++20 compiler, CMake 3.30+
  • Removed scikit-build-core and pybind11 (auto-installed via pip install)

• Build order: Reordered to TypeScript → Python → C++ to match Running Tests section

Original prompt

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This section details on the original issue you should resolve

<issue_title>readme有些不准确的地方</issue_title>
<issue_description>Prerequisites

C++20 compatible compiler
CMake 3.30+
For TypeScript: Emscripten SDK
For Python: Python 3.10-3.14, scikit-build-core, pybind11

这个地方，cmake和c++20 compiler是python和c++需要的，ts会直接用emscripten。另外python那里不需要写pybind11和scikit build core，这个会在python -m build或者pip install .的时候自动安装。

下面的 Running Tests 顺序和上面的build顺序不一致，统一按照ts， python， cxx的顺序来吧。</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes readme有些不准确的地方 #25

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