docs: add Chinese translation for README

[JasonYeYuhe]

docs: add Chinese translation for README

Description

This PR introduces a high-quality Chinese translation of the README (README.zh.md) and adds a language switcher to the main README.md.

Motivation

World Monitor is an exceptional tool for real-time situational awareness. Given the high interest in geopolitical monitoring, financial intelligence, and AI-driven news aggregation in the Chinese-speaking community, providing a localized README will significantly lower the barrier for new users and contributors.

This translation covers:

• Core features (AI briefs, dual map engine, situational awareness).
• Quick-start instructions for local development and self-hosting.
• Detailed tech stack and licensing information.
• All download links and variant-specific descriptions.

Changes

• Created README.zh.md with localized terminology.
• Added English/Chinese language switcher at the top of the main README.

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Translated and contributed by @JasonYeYuhe

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[Copilot]

Pull request overview

Adds a Chinese-localized README to improve accessibility for Chinese-speaking users and introduces a simple language switcher in the primary README.

Changes:

• Added README.zh.md containing a Chinese translation of the project README content.
• Added an English/Chinese language switcher link line near the top of README.md.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
README.zh.md	New Chinese translation of the README, including badges, quick start, tech stack, and other project sections.
README.md	Adds a language switcher linking to the Chinese README.

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[Copilot]

The Star History image URLs include the type=Date query parameter twice (...&type=Date&type=Date...). This is redundant and could cause unexpected behavior depending on how the endpoint parses duplicate params; please remove the duplicate so each URL only specifies type=Date once.

Suggested change

	<source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/svg?repos=koala73/worldmonitor&type=Date&type=Date&theme=dark" />
	<img alt="Star History Chart" src="https://api.star-history.com/svg?repos=koala73/worldmonitor&type=Date&type=Date" />
	<source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/svg?repos=koala73/worldmonitor&type=Date&theme=dark" />
	<img alt="Star History Chart" src="https://api.star-history.com/svg?repos=koala73/worldmonitor&type=Date" />

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[chatgpt-codex-connector]

Correct the non-commercial license restriction

If Chinese readers rely on this section to understand reuse rights, they will be told that AGPL-3.0 only covers non-commercial use and that any commercial use needs a separate commercial license. That does not match the repository's LICENSE, which is the standard AGPLv3 text (LICENSE:4-7) and even states that recipients may charge any price for conveyed copies (LICENSE:191-202). Because this new translation introduces the same restriction language as authoritative project documentation, it materially misstates the actual license terms.

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