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
• provide a .env.example template and README note for configuring deployments quickly

Testing

• python -m py_compile app.py

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Codex Task

[chatgpt-codex-connector]

💡 Codex Review

https://github.com/TimUx/fpp-control/blob/34b0439fdc356c68ba72d45af645fa8c1bef61ca/Dockerfile#L8
Include new HTML pages in Docker image

The Docker build still copies only index.html and styles.css, so the newly added donation.html and requests.html never make it into the image. Running the container as documented will return 404s for /donation and /requests because those files are missing while the Flask routes expect them. Add the new pages to the COPY list so they are served in Docker deployments.

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