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/FlexForms/Eventlist.xml

@@ -9,6 +9,29 @@
                 <sheetTitle>Event List Settings</sheetTitle>
                 <type>array</type>
                 <el>
+                    <settings.layout>
+                        <label>Layout</label>
+                        <config>
+                            <type>select</type>
+                            <renderType>selectSingle</renderType>
+                            <items>
+                                <numIndex index="0">
+                                    <label>List View</label>
+                                    <value>list</value>
+                                </numIndex>
+                                <numIndex index="1">
+                                    <label>Grid View</label>
+                                    <value>grid</value>
+                                </numIndex>
+                                <numIndex index="2">
+                                    <label>Teaser Bar</label>
+                                    <value>teaserbar</value>
+                                </numIndex>
+                            </items>
+                            <default>list</default>
+                        </config>
+                    </settings.layout>
+
                     <settings.daysinadvance>
                         <label>Days in advance (0 = no limit)</label>
                         <description>Only show upcoming events starting within the next N days, e.g. 60.</description>