feat: add codex in devcontainer

[mjun0812]

This pull request updates the development container configuration to improve environment setup and user experience. The main changes include refining environment variable settings, expanding installed packages, adjusting mount points for configuration sharing, and specifying user settings for the container.

Environment configuration improvements:

• Changed the UV_CACHE_DIR environment variable to use a fixed path (/home/vscode/.cache/uv) and added a new CLAUDE_CONFIG_DIR variable for Claude configuration (/home/vscode/.claude).

Package and feature enhancements:

• Added fd-find to the list of installed packages for enhanced file searching capabilities.

User and mount point adjustments:

• Set both remoteUser and containerUser to vscode to ensure consistent user context within the container.
• Updated mount points to bind local .claude and .codex configuration directories and files into the container, and added a shell history volume for improved developer workflow.

Post-creation and startup commands:

• Enhanced the postCreateCommand to install the latest version of @openai/codex globally via npm before syncing Python dependencies.

[Copilot]

Pull Request Overview

This pull request enhances the development container configuration to integrate Codex support and improve the developer experience. The changes streamline environment setup by adding Codex-related configurations, package installations, and mount points for better configuration sharing.

• Added Codex integration with global npm installation and configuration directory mounting
• Enhanced environment configuration with fixed cache paths and Claude config directory
• Improved developer workflow with additional packages and shell history persistence

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