docs: replace README with curated bilingual text

[Hamedghz]

Summary

• replace the README with the curated bilingual overview, setup steps, and feature list provided for AION-OS
• highlight repository structure, configuration matrix, observability, testing, and security guidance in English and Persian

Testing

• not run

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https://chatgpt.com/codex/tasks/task_e_6900f6a3481c8328a16b34d00ed134c8

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Correct bigdata env template path in Quick Start

The Quick Start commands ask users to copy .env.bigdata.example before running ./scripts/dev-up.sh, but this template does not exist anywhere in the repository. The only provided file is bigdata/.env.example, so the current command fails with cp: cannot stat '.env.bigdata.example': No such file or directory and stops the setup flow. The same typo appears again in the Persian section. Updating the README to reference cp bigdata/.env.example bigdata/.env avoids a broken quick-start.

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