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/Configuration/Sets/Vitecset/setup.typoscript

@@ -1,4 +1,6 @@
 config {
+  # EXT:solr indexes pages only when indexing is explicitly enabled
+  index_enable = 1
   pageTitleProviders {
     vitec {
       provider = Evomedien\Vitec\PageTitle\ProductPageTitleProvider
@@ -32,6 +34,19 @@ tt_content {
         }
     }
 
+    # EXT:solr search results as JSON - the search endpoint for the React frontend
+    solr_pi_results < lib.contentElementWithHeader
+    solr_pi_results {
+        fields {
+            content {
+                fields {
+                    search = USER
+                    search.userFunc = Evomedien\Vitec\UserFunc\SearchJsonRenderer->render
+                }
+            }
+        }
+    }
+
     news_pi1 < lib.contentElementWithHeader
     news_pi1 {
         fields {
@@ -278,3 +293,46 @@ config.recordLinks {
         }
     }
 }
+
+# Highlighted teaser fragments for the JSON search results (SearchJsonRenderer)
+plugin.tx_solr.search.results.resultsHighlighting = 1
+plugin.tx_solr.search.results.resultsHighlighting.wrap = <mark>|</mark>
+
+
+# Headless has no TYPO3SEARCH_begin/end markers in its JSON output, so the
+# default page content extraction indexes an EMPTY content field. Build the
+# content from the page's tt_content rows instead: header, subheader, bodytext
+# cover core CTypes and the Content Blocks (their text fields reuse bodytext),
+# vitec_quote is the only Content Blocks text column of its own. SOLR_CONTENT
+# strips markup before indexing. Collection children (FAQ items, cards) live in
+# their own tables and are not covered yet.
+plugin.tx_solr.index.queue.pages.fields {
+    content = SOLR_CONTENT
+    content {
+        cObject = COA
+        cObject {
+            10 = CONTENT
+            10 {
+                table = tt_content
+                select {
+                    orderBy = sorting
+                }
+                renderObj = COA
+                renderObj {
+                    10 = TEXT
+                    10.field = header
+                    10.noTrimWrap = || |
+                    20 = TEXT
+                    20.field = subheader
+                    20.noTrimWrap = || |
+                    30 = TEXT
+                    30.field = bodytext
+                    30.noTrimWrap = || |
+                    40 = TEXT
+                    40.field = vitec_quote
+                    40.noTrimWrap = || |
+                }
+            }
+        }
+    }
+}