Sub-solution workbook pipeline on layout 5, fix element order in both importers

- New, deliberately separate pipeline for sub-solutions (markets and
  solutions must never break each other): generator
  vitec:generate-subsolution-workbooks (list from the page tree below
  /solutions, 39 workbooks, every sub-solution matched to its record),
  SubsolutionWorkbookImporter + CLI vitec:import-subsolution-workbooks,
  and a "Sub-Solutions" tab in the VITEC Import module with its own
  inbox migrations/subsolutions_xlsx_in/
- Targets the existing template 5 "Solution Detail" without changing
  it: hero element in colPos 1, the remaining sections in fixed order in
  colPos 0, found again by CType on re-import; existing empty sub-solution
  pages are switched to layout 5, missing ones created hidden;
  detail_page set on the solution record
- Workbook per the Figma "07 Solution Detail page": hero without video
  teaser, intro with headline and without learn-more/portfolio, extended
  icon list, own page-layout reference image
- Shared content elements: market hero/intro/insights relabelled
  "Market/Solution", market intro gains the optional intro_headline
  field (new column, requires extension:setup)
- Fix: DataHandler puts every NEW record with a positive pid at the top
  of its column, so pages built in one run came out reversed. Both
  importers now track the page order per colPos and write
  tt_content.sorting explicitly after the DataHandler run; re-applying
  repairs pages imported earlier (verified on the control-room
  sub-solution and sub-market page 443)
- migrations/fill_test_subsolution.php: realistic test content from
  vitec.com copy and images for the control-room sub-solution
- Docs section 5z

packages/vitec/Classes/Command/ImportSubsolutionWorkbooksCommand.php

@@ -0,0 +1,91 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Evomedien\Vitec\Command;
+
+use Evomedien\Vitec\Import\SubsolutionWorkbookImporter;
+use Symfony\Component\Console\Attribute\AsCommand;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+use TYPO3\CMS\Core\Core\Bootstrap;
+
+/**
+ * CLI shell around SubsolutionWorkbookImporter - the deliberate sibling of
+ * vitec:import-submarket-workbooks (markets and solutions evolve
+ * independently; behavior and lessons are documented on the importer).
+ *
+ *   vendor/bin/typo3 vitec:import-subsolution-workbooks --dir=migrations/subsolutions_xlsx_in
+ *   vendor/bin/typo3 vitec:import-subsolution-workbooks --dir=... --only=iptv --apply
+ */
+#[AsCommand(
+    name: 'vitec:import-subsolution-workbooks',
+    description: 'Import filled sub-solution workbooks into layout-5 pages (dry-run by default)'
+)]
+final class ImportSubsolutionWorkbooksCommand extends Command
+{
+    public function __construct(private readonly SubsolutionWorkbookImporter $importer)
+    {
+        parent::__construct();
+    }
+
+    protected function configure(): void
+    {
+        $this->addOption('dir', null, InputOption::VALUE_REQUIRED, 'Directory with filled workbooks', 'migrations/subsolutions_xlsx_in');
+        $this->addOption('only', null, InputOption::VALUE_REQUIRED, 'Only files whose name contains this substring');
+        $this->addOption('apply', null, InputOption::VALUE_NONE, 'Write changes (default: dry run)');
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        Bootstrap::initializeBackendAuthentication();
+        $apply = (bool)$input->getOption('apply');
+        $only = mb_strtolower((string)($input->getOption('only') ?? ''));
+        $dir = rtrim((string)$input->getOption('dir'), '/');
+
+        if (!is_dir($dir)) {
+            $output->writeln('<error>Directory not found: ' . $dir . '</error>');
+            return Command::FAILURE;
+        }
+        $files = [];
+        $iterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($dir));
+        foreach ($iterator as $fileInfo) {
+            $name = $fileInfo->getFilename();
+            if ($fileInfo->isFile() && str_ends_with($name, '.xlsx') && !str_starts_with($name, '~$')) {
+                if ($only === '' || str_contains(mb_strtolower($name), $only)) {
+                    $files[] = $fileInfo->getPathname();
+                }
+            }
+        }
+        sort($files);
+        if ($files === []) {
+            $output->writeln('No workbooks found in ' . $dir);
+            return Command::SUCCESS;
+        }
+        $output->writeln(count($files) . ' workbook(s) · ' . ($apply ? 'APPLY' : 'DRY-RUN'));
+
+        $errors = 0;
+        foreach ($files as $file) {
+            try {
+                $result = $this->importer->importFile($file, $apply);
+                $output->writeln(sprintf("\n<info>%s</info>  (%s / %s)", $result['file'], $result['group'], $result['subsolution']));
+                foreach ($result['report'] as $line) {
+                    $output->writeln('      <comment>' . $line . '</comment>');
+                }
+                $output->writeln(sprintf('      page %s · %d element(s) touched · %s',
+                    $result['newPage'] && $result['pageUid'] === 0 ? 'NEW' : '#' . $result['pageUid'],
+                    $result['elements'],
+                    $apply ? 'written.' : 'dry run'));
+            } catch (\Throwable $e) {
+                $errors++;
+                $output->writeln('<error>' . basename($file) . ': ' . $e->getMessage() . '</error>');
+            }
+        }
+        if (!$apply) {
+            $output->writeln("\nDRY RUN - nothing written. Add --apply to write.");
+        }
+        return $errors > 0 ? Command::FAILURE : Command::SUCCESS;
+    }
+}