Add search functionality to blog entries list in administration

[Copilot]

Administrators need to search through blog entries in the administration panel. Translation keys existed but the feature was not implemented.

Changes

werkl-blog-list/index.js

• Added term data property
• Added onSearch(term) method to handle search input
• Modified getList() to apply criteria.setTerm(this.term) when search term exists

werkl-blog-list.html.twig

• Added sw-simple-search-field component in search-bar slot
• Bound to existing translation key werkl-blog.general.placeholderSearchBar

getList() {
    const criteria = new Criteria(this.page, this.limit);
    // ... associations and sorting ...
    
    if (this.term) {
        criteria.setTerm(this.term);
    }
    
    return this.blogEntryRepository.search(criteria, Shopware.Context.api);
}

Search works alongside existing category filtering. Uses Shopware's standard entity search pattern.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Can we make the blog entries in the administration searchable?</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Can we make the blog entries in the administration searchable? #43

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