[WIP] Fix invalid JSON in devcontainer.json file

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Fix the .devcontainer/devcontainer.json file in the repository. The file currently contains two separate JSON objects, which is invalid. Merge them into a single valid JSON object.

Requirements for the merged devcontainer.json:

1. Use the image "mcr.microsoft.com/devcontainers/universal:2".
2. Include "hostRequirements": { "cpus": 4 }.
3. Set "forwardPorts": [3000, 6006].
4. Combine the commands:
   • "updateContentCommand": "npm install"
   • "postCreateCommand": "./scripts/setup-git-auth.sh || true && npm install -g @google/gemini-cli@latest"
   • "postAttachCommand": { "server": "npm start" }
5. Include extensions:
   • "GitHub.vscode-pull-request-github"
   • "GitHub.vscode-github-actions"
   • "ms-azuretools.vscode-docker"
6. Include Codespaces customization: "openFiles": ["src/App.jsx"].
7. Add a new environment variable GITHUB_DNS_VERIFICATION_CODE with the value "c73489685d" to the containerEnv section.

Also, create a .env file in the root directory by copying .env.example and adding GITHUB_DNS_VERIFICATION_CODE=c73489685d to it.

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