[Ecosystem] Add .devcontainer for Codespaces #194
Description
Tracked From
Summary
Add .devcontainer/devcontainer.json for React/Vite/Node.js development environment.
Priority
Tier 4: Standardized dev environment.
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Add .devcontainer/devcontainer.json for React/Vite/Node.js development environment.
Tier 4: Standardized dev environment.