docs: add middleware mode quick example

[chenjiahan]

Summary

• add a quick middlewareMode configuration example to the English server middleware docs
• mirror the new example in the Chinese documentation

Testing

• not run

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Codex Task

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[Copilot]

Pull Request Overview

This PR enhances the middleware mode documentation by adding a simple quick-start example before the more complex integration example, improving the learning curve for users.

Key Changes:

• Adds a new "Enable middleware mode" section with a basic configuration example
• Restructures the "Example" section to "Examples" with multiple subsections
• Mirrors changes in both English and Chinese documentation for consistency

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
website/docs/en/config/server/middleware-mode.mdx	Adds a quick-start example showing basic middleware mode configuration and renames "Example" to "Examples" with subsections
website/docs/zh/config/server/middleware-mode.mdx	Mirrors the English documentation changes with appropriate Chinese translations

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