docs: clarify new URL asset handling

[Timeless0911]

Summary

This PR updates the English and Chinese static asset docs for the new URL() behavior introduced in #1781.

• Clarify URL asset output, built-in loader handling, and bundleless entry exclusions.
• Document how to disable URL parsing globally or skip individual references with rspackIgnore, including asset copying and downstream consumption considerations.

Related Links

• feat(core)!: preserve new URL assets as relative URLs #1781

Checklist

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

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[Copilot]

Pull request overview

This PR refines the static asset documentation (English + Chinese) to match the new URL(path, import.meta.url) asset behavior introduced in #1781, including what gets emitted, how URL parsing interacts with built-in loaders, and how to opt out globally or per-reference.

Changes:

• Clarifies that new URL() asset references are rewritten to point at emitted output assets (with updated examples).
• Documents that certain file types referenced via new URL() are treated as URL assets and bypass built-in loaders.
• Adds guidance for bundleless entry glob exclusions and opt-out mechanisms (disable URL parser / rspackIgnore).

Reviewed changes

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

File	Description
website/docs/en/guide/advanced/static-assets.mdx	Updates English docs for new URL() asset emission, bundleless exclusions, and opt-out options.
website/docs/zh/guide/advanced/static-assets.mdx	Updates Chinese docs for new URL() asset emission, bundleless exclusions, and opt-out options.