docs(link): add link component target api docs

[IKEYCY]

PR

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Please check if your PR fulfills the following requirements:

• The commit message follows our Commit Message Guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

Summary by CodeRabbit

• New Features
  • Added a new public target prop to the Link component to control where links open (_blank, _self, _parent, _top), defaulting to _self.
  • Added interactive demos showing each target behavior.
  • Added automated tests validating link target attributes and href values to ensure correct runtime behavior.

[coderabbitai]

Walkthrough

Adds a new target public prop to the Link component and supplies demos, a composition-api demo, Playwright tests, and a documentation demo entry demonstrating and verifying the four target modes (_blank, _self, _parent, top).

Changes

Cohort / File(s)	Summary
API Definition examples/sites/demos/apis/link.js	Appended a new public prop target with type `'_self'
Demo Components examples/sites/demos/pc/app/link/target.vue, examples/sites/demos/pc/app/link/target-composition-api.vue	Added two Vue demo components rendering four TinyLink instances with targets _blank, _self, _parent, _top (underline disabled), plus scoped layout styles.
Test Coverage examples/sites/demos/pc/app/link/target.spec.ts	Added Playwright tests asserting there are 4 demo links, each has the expected target attribute and link text, and all links share the expected href; includes pageerror handler.
Documentation examples/sites/demos/pc/app/link/webdoc/link.js	Inserted a new demo entry (demoId: 'target') with localized name and description referencing target.vue in the demos array.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 A little prop named target springs,
Four doors to open, fluttering wings,
Demos lined up, tests hop through,
Docs show the paths, both old and new,
I nibble code crumbs — delight in small things.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'docs(link): add link component target api docs' accurately describes the main change: adding documentation and demo files for the link component's target API property.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@examples/sites/demos/apis/link.js`:
- Around line 74-84: The pcDemo value is incorrect: update the property pcDemo
on the prop object for name 'target' from 'open-mode' to 'target' so it matches
the demo entry demoId 'target' (which references codeFiles ['target.vue']);
ensure the object containing name: 'target' has pcDemo: 'target' to restore
correct linking between the prop and the demo.

[zzcr]

这里是不是要改成：‘target’