Fix dev container: remove pyright, use apt for cmake, remove auto-sync

[Copilot]

Dev container had three issues: redundant pyright extension conflicting with Pylance, problematic cmake feature, and unwanted auto-sync of dependencies on container creation.

Changes

• devcontainer.json: Remove ms-pyright.pyright extension (Pylance includes pyright functionality)
• devcontainer.json: Remove ghcr.io/devcontainers-extra/features/cmake:1 feature
• post-create.sh: Add cmake to apt-get install
• post-create.sh: Remove uv sync --locked --extra dev, npm ci --include=dev, and pre-commit install

Developers now manually run dependency sync and pre-commit setup as needed.

Original prompt

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This section details on the original issue you should resolve

<issue_title>dev container 依然不够完善。</issue_title>
<issue_description>1. pyright似乎是多余的, 应该删掉

Pyright has detected that the Pylance extension is installed. Pylance includes the functionality of Pyright, and running both of these extensions can lead to problems. Pyright will disable itself. Uninstall or disable Pyright to avoid this message.

2. cmake 这个 feature 有点问题， 请使用apt来完成cmake的安装， 而不是使用feature

3. uv sync --locked --extra dev 和 npm ci --include=dev 应该开发的时候手动同步， 不要写在dev container的脚本里， pre commit 也不要写在里面。
   </issue_description>

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

• Fixes dev container 依然不够完善。 #57

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