Add JSON-LD structured data design spec

[dereuromark]

Summary

Add JSON-LD structured data support to MetaHelper for Schema.org markup generation.

Features

• BreadcrumbList schema - setBreadcrumbs() / getBreadcrumbs()
• Article schema - setArticle() / getArticle()
• Organization schema - setOrganization() / getOrganization() with global config merge support

API

// Breadcrumbs
$this->Meta->setBreadcrumbs([
    ['name' => 'Home', 'url' => '/'],
    ['name' => 'Blog', 'url' => '/blog'],
    ['name' => 'My Post'],
]);

// Article
$this->Meta->setArticle([
    'headline' => 'My Article',
    'author' => 'John Doe',
    'datePublished' => '2026-03-19',
]);

// Organization (supports global config merge)
$this->Meta->setOrganization([
    'name' => 'Acme Inc',
    'url' => 'https://acme.com',
]);

// Output included in out() automatically
echo $this->Meta->out();

Changes

• Added $_jsonLd storage property and renderJsonLd() helper
• Implemented setBreadcrumbs/getBreadcrumbs with validation
• Implemented setArticle/getArticle with validation
• Implemented setOrganization/getOrganization with global config merge
• Integrated JSON-LD output into out() method
• Added 17 new tests (30 total tests, 90 assertions)
• Updated documentation

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 97.77778% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.56%. Comparing base (a460509) to head (8ff8cb8).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/View/Helper/MetaHelper.php	97.77%	2 Missing ⚠️
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Additional details and impacted files

@@             Coverage Diff              @@
##             master      #14      +/-   ##
============================================
+ Coverage     92.22%   93.56%   +1.33%     
- Complexity      118      153      +35     
============================================
  Files             1        1              
  Lines           283      373      +90     
============================================
+ Hits            261      349      +88     
- Misses           22       24       +2     

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