Add access code gate for UI access

[TimUx]

Summary

• add an access-code gate on the home page with env-driven config and localStorage unlocking
• guard the wish and donation pages behind the same code and style a prominent entry field
• document the ACCESS_CODE variable and generate it into config.js via the entrypoint

Testing

• python -m py_compile app.py

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Copy request/donation pages into Docker image

The Dockerfile only copies index.html, styles.css, config.template.js, docker-entrypoint.sh, and app.py, but the newly added requests.html and donation.html pages are not included. When building and running the container (the documented deployment path), the Flask routes /requests and /donation will serve 404s because the underlying files are missing from the image, so the new access-gated pages are unusable.

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