docs: update config file examples with title

[chenjiahan]

Summary

Update code examples in config documentation files with explicit file titles (e.g., ts title="rsbuild.config.ts") for better clarity and consistency.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR updates code examples in Chinese and English config documentation files by adding explicit file titles (e.g., ts title="rsbuild.config.ts") to TypeScript code blocks for better clarity and consistency.

• Updates code block declarations from js or ts to ts title="rsbuild.config.ts"
• Standardizes configuration examples across all documentation files
• Improves code clarity by explicitly showing the target filename

Reviewed Changes

Copilot reviewed 107 out of 107 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
website/docs/zh/config/tools/swc.mdx	Added title attributes to TypeScript config examples
website/docs/zh/config/tools/style-loader.mdx	Added title attributes to TypeScript config examples
website/docs/zh/config/tools/postcss.mdx	Added title attributes to TypeScript config examples
website/docs/zh/config/tools/lightningcss-loader.mdx	Added title attributes to TypeScript config examples
website/docs/zh/config/tools/html-plugin.mdx	Added title attributes to TypeScript config examples
website/docs/zh/config/tools/css-loader.mdx	Added title attributes to TypeScript config examples
website/docs/zh/config/tools/css-extract.mdx	Added title attributes to TypeScript config examples
website/docs/zh/config/source/*.mdx	Added title attributes to TypeScript config examples
website/docs/zh/config/server/*.mdx	Added title attributes to TypeScript config examples
website/docs/zh/config/security/*.mdx	Added title attributes to TypeScript config examples
website/docs/zh/config/resolve/*.mdx	Added title attributes to TypeScript config examples
website/docs/zh/config/performance/*.mdx	Added title attributes to TypeScript config examples
website/docs/zh/config/output/*.mdx	Added title attributes to TypeScript config examples
website/docs/zh/config/html/*.mdx	Added title attributes to TypeScript config examples
website/docs/zh/config/environments.mdx	Added title attributes to TypeScript config examples
website/docs/zh/config/dev/*.mdx	Added title attributes to TypeScript config examples
website/docs/en/config/tools/*.mdx	Added title attributes to TypeScript config examples
website/docs/en/config/source/*.mdx	Added title attributes to TypeScript config examples
website/docs/en/config/server/*.mdx	Added title attributes to TypeScript config examples
website/docs/en/config/security/*.mdx	Added title attributes to TypeScript config examples
website/docs/en/config/resolve/*.mdx	Added title attributes to TypeScript config examples
website/docs/en/config/performance/*.mdx	Added title attributes to TypeScript config examples
website/docs/en/config/output/*.mdx	Added title attributes to TypeScript config examples
website/docs/en/config/html/*.mdx	Added title attributes to TypeScript config examples
website/docs/en/config/environments.mdx	Added title attributes to TypeScript config examples
website/docs/en/config/dev/*.mdx	Added title attributes to TypeScript config examples

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