Success-story migration + new plugins + JSON/UX polish

- Success Stories: full migration from old site (48/48, audited),
  markets n:n, quotation content block, columns content block,
  pretty SEO detail URLs via SuccessStoryPathRewrite middleware,
  list/detail split (list page 4 / story page), detailUrl/backUrl
- New plugins: VITEC Locations (grid/list/map + RTE map text),
  VITEC Customer Logos (color/bw logic, only-show-selected),
  VITEC Card (one plugin for product/story/market/solution
  with reloading FlexForm + custom backend preview renderer)
- Eventlist: layout dropdown (list/grid/teaserbar) in settings
- Hero section CB: Images/Video tabs, background video + overlay
- Product JSON: full category rootline (parents), fixed missing
  ConnectionPool import (all-products crash), category tree map
- Backend preview CSS: container-query responsive (narrow columns)
- Docs: ISO architecture spec, root + extension READMEs

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/vitec/Configuration/TCA/tx_vitec_domain_model_usecase.php

@@ -34,7 +34,7 @@ return [
                 --div--;Detail · Content,
                     content_elements,
                 --div--;Detail · Related,
-                    market, solutions, products, categories,
+                    markets, solutions, products, categories,
                 --div--;SEO,
                     seo_title, seo_description, no_index, no_follow, canonical_link,
                     --palette--;Open Graph;ogPalette,
@@ -182,15 +182,16 @@ return [
         ],
 
         // --------------------------------------------------- Detail · Related
-        'market' => [
-            'label'  => 'Market',
+        'markets' => [
+            'label'  => 'Markets',
             'config' => [
-                'type'          => 'select',
-                'renderType'    => 'selectSingle',
+                'type'        => 'select',
+                'renderType'  => 'selectMultipleSideBySide',
                 'foreign_table' => 'tx_vitec_domain_model_market',
-                'items'         => [['label' => '', 'value' => 0]],
-                'default'       => 0,
-                'maxitems'      => 1,
+                'MM'          => 'tx_vitec_usecase_market_mm',
+                'size'        => 6,
+                'autoSizeMax' => 20,
+                'maxitems'    => 9999,
             ],
         ],
         'solutions' => [