SEO record links; story markets repair; story page titles

Kev's keyword CSV and TYPO3 hold the same solutions under slightly
different names, so the structure check filed them as missing/extra.
Matching is now slug -> normalized title -> record alias, using the
per-model alias store the import tabs got on 2026-08-18
(tx_vitec_import_mapping.record_aliases, key = lowercased CSV name).
One link therefore serves the import union list, the structure check
and vitec:create-markets (same service - linked rows are no longer
proposed as new records).

- every "Missing in TYPO3" row carries a select of all records the
  direct match did not claim; "Save record links" persists per model
- alias-matched rows show under "Both" with a "linked" badge and the
  same select; option 0 removes the link
- SeoResearchService::recordsCheck() additionally returns `linkable`
  (the select options) and flags alias matches with via=link
- new backend POST route seo_aliases

Success stories: --markets-only repair mode
- /success-stories emitted empty `markets` for all 48 stories - a data
  problem (code and TCA untouched since 17.08.); read-only diagnosis
  script migrations/check_usecase_markets.php added
- vitec:import-success-stories --markets-only re-derives each story's
  industries from the export exactly like the full import and rewrites
  ONLY the markets MM relation of the existing record via DataHandler;
  nothing else is touched, no usecase created or deleted, unresolved
  stories keep their current relations
- decision: industries are translated onto the nine main markets of
  the current taxonomy (INDUSTRY_TO_MARKET) instead of recreating the
  seven deleted industry markets; the repair mode never creates
  market records (root cause: those industry markets were deleted
  after the 07.08. taxonomy import, orphaning all story relations)
- ensureMarkets() gained a $create flag for reuse by the full import

Story detail pages: real page title
- every story page answered with the generic page title "Story"; same
  defect and same fix as the product pages on 21.08.: new
  UsecasePageTitleProvider (singleton), registered as vitecUsecase in
  config.pageTitleProviders, fed from UsecaseShowJsonRenderer with
  seo_title falling back to title

Requires on the server:
    vendor/bin/typo3 cache:flush

packages/vitec/Classes/Controller/Backend/ImportController.php

@@ -173,6 +173,47 @@ final class ImportController
         return new RedirectResponse((string)$this->uriBuilder->buildUriFromRoute('web_vitecimport.seo'), 303);
     }
 
+    /**
+     * Persist hand-made record links from the SEO structure check. Shares the
+     * per-model alias store with the import tabs (MappingRepository), so a
+     * link made in either place serves both - and vitec:create-markets stops
+     * proposing linked rows as new records. Key convention is the import
+     * tab's: lowercased, trimmed CSV name. uid 0 removes a link.
+     */
+    public function seoAliasesAction(ServerRequestInterface $request): ResponseInterface
+    {
+        $body = (array)$request->getParsedBody();
+        $modelKey = (string)($body['model'] ?? '');
+        if ($this->registry->has($modelKey)) {
+            $aliases = $this->mappingRepository->load($modelKey)['aliases'] ?? [];
+            $names = is_array($body['aliaskey'] ?? null) ? $body['aliaskey'] : [];
+            $selected = is_array($body['alias'] ?? null) ? $body['alias'] : [];
+            $changed = 0;
+            foreach ($selected as $index => $selectedUid) {
+                $key = mb_strtolower(trim((string)($names[$index] ?? '')));
+                if ($key === '') {
+                    continue;
+                }
+                $uid = (int)$selectedUid;
+                $current = (int)($aliases[$key] ?? 0);
+                if ($uid > 0 && $uid !== $current) {
+                    $aliases[$key] = $uid;
+                    $changed++;
+                } elseif ($uid === 0 && $current > 0) {
+                    unset($aliases[$key]);
+                    $changed++;
+                }
+            }
+            $this->mappingRepository->saveAliases($modelKey, $aliases);
+            $this->flash(
+                sprintf('%d record link(s) changed for %s.', $changed, $modelKey),
+                'Record links saved',
+                true
+            );
+        }
+        return new RedirectResponse((string)$this->uriBuilder->buildUriFromRoute('web_vitecimport.seo'), 303);
+    }
+
     // ------------------------------------------------------------ rendering
 
     /**