Document secure secrets and prune unused assets

[handsomezhuzhu]

Summary

• document secure SECRET_KEY and ADMIN_PASSWORD setup in README and .env template and require them in docker-compose files
• enforce strong secrets at container startup to prevent weak defaults
• remove unused Windows scripts and extraneous docs to reduce clutter and risk of outdated guidance

Testing

• python -m compileall backend

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Codex Task

[handsomezhuzhu]

@codex @copilot @claude 审查代码，确保不会影响正常部署和使用，也保证项目安全，且没有密钥泄露

[Copilot]

@handsomezhuzhu I've opened a new pull request, #2, to work on those changes. Once the pull request is ready, I'll request review from you.

[chatgpt-codex-connector]

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