Add Solr search: EXT:solr 14 integration and JSON search endpoint

Apache Solr 10 runs on a dedicated VPS behind a Caddy HTTPS proxy
(vitecsolr.evomedien.de) because the managed webserver only allows
outgoing standard ports. Credentials stay out of git: the site config
carries %env()% placeholders resolved via putenv() in the git-ignored
config/system/additional.php.

- composer: apache-solr-for-typo3/solr 14.0.0-RC1 (the only line
  compatible with TYPO3 14; final 14.0.0 will arrive via composer update)
- config.yaml: read connection https/443, core_en per language,
  env placeholder credentials; .gitignore covers additional.php
- setup.typoscript: config.index_enable = 1 (page indexing silently
  refuses without it), solr_pi_results JSON renderer registration,
  results highlighting, and content field extraction from tt_content
  rows - the headless JSON output has no TYPO3SEARCH markers, so the
  default page content extraction indexed an empty content field
- SearchJsonRenderer (renderer #27): JSON output for the search plugin
  on /search. GET q/page in; { query, page, resultsPerPage, numFound,
  totalPages, results[], suggestions } out. Disables the page cache per
  request: config.no_cache is gone in TYPO3 v14, and q/page are
  excluded from cHash, so cached variants would collide
- ext_localconf.php: q and page added to cacheHash excludedParameters
- SolrIndexCommand (vitec:solr-index): works the index queue from the
  CLI with connection diagnostics and a --debug single-step mode -
  EXT:solr 14 ships no console commands and the backend button indexes
  one item per click

packages/vitec/Classes/DataProcessing/ContainerChildrenProcessor.php

@@ -20,6 +20,7 @@ use Evomedien\Vitec\UserFunc\CustomerlogosJsonRenderer;
 use Evomedien\Vitec\UserFunc\FormsJsonRenderer;
 use Evomedien\Vitec\UserFunc\ModelcardJsonRenderer;
 use Evomedien\Vitec\UserFunc\NewsJsonRenderer;
+use Evomedien\Vitec\UserFunc\SearchJsonRenderer;
 use TYPO3\CMS\Core\Database\Connection;
 use TYPO3\CMS\Core\Database\ConnectionPool;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
@@ -132,6 +133,7 @@ final class ContainerChildrenProcessor implements DataProcessorInterface
         'vitec_contactform' => [FormsJsonRenderer::class, 'form'],
         'vitec_demoform' => [FormsJsonRenderer::class, 'form'],
         'vitec_helpdeskform' => [FormsJsonRenderer::class, 'form'],
+        'solr_pi_results' => [SearchJsonRenderer::class, 'search'],
         'news_pi1' => [NewsJsonRenderer::class, 'news'],
         'news_newsliststicky' => [NewsJsonRenderer::class, 'news'],
         'news_newsselectedlist' => [NewsJsonRenderer::class, 'news'],