Rebuild DEEG as a fifth installation, add stepped forms and a plugin system, and clear the review backlog

Forms gained steps, conditions, image choices, number fields with units and a
summary step; the DEEG price finder uses all of it. Plugins are manifest plus
Twig: blocks, settings, containers, routes, presets and theme packs, switched
per installation. The review backlog is done: archive pages render through the
normal page pipeline, forms and post lists work inside areas and sections,
repeated sections get their own ids, breakpoints and colours come from the
palette, backup and update work on MySQL and lock each other out.

The task worker no longer shortens a process that has no time limit:
set_time_limit() sets the limit instead of extending it, which turned an
unlimited CLI run into eighty seconds and killed the full test suite far away
from the scheduler.

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

templates/page.html.twig

@@ -9,6 +9,7 @@
     <title>{{ seoTitle }}</title>
     <meta name="description" content="{{ page.document.description }}">
     {% if canonical|default(null) %}<link rel="canonical" href="{{ canonical }}">{% endif %}
+    {% if pagination|default(null) %}{% if pagination.page > 1 %}<link rel="prev" href="{{ pagination.base }}{{ pagination.page > 2 ? '?seite=' ~ (pagination.page - 1) : '' }}">{% endif %}{% if pagination.page < pagination.pages %}<link rel="next" href="{{ pagination.base }}?seite={{ pagination.page + 1 }}">{% endif %}{% endif %}
     {% if page.robots|default('index') != 'index' %}<meta name="robots" content="noindex, follow">{% endif %}
     <meta property="og:title" content="{{ seoTitle }}">
     <meta property="og:description" content="{{ page.document.description }}">
@@ -49,16 +50,20 @@
     {% if page.document.schemaVersion >= 2 %}<link rel="stylesheet" href="/assets/design.css?v={{ kant_version() }}">{% endif %}
     {% if page.document.schemaVersion >= 3 %}<link rel="stylesheet" href="/assets/enhancements.css?v={{ kant_version() }}">{% endif %}
     {% endif %}
+    {% for href in pluginStyles|default([]) %}<link rel="stylesheet" href="{{ href }}">{% endfor %}
 {% if hasPosts|default(false) %}    <link rel="alternate" type="application/rss+xml" title="Beiträge" href="/feed.xml">
 {% endif %}
     {% if needsTabs|default(false) %}<script src="/assets/tabs.js?v={{ kant_version() }}" defer></script>{% endif %}
+    {% if needsFormScript|default(false) and not editing|default(false) %}<script src="/assets/form-steps.js?v={{ kant_version() }}" defer></script>{% endif %}
     {% if needsSlider|default(false) %}<script type="module" src="/assets/slider.js?v={{ kant_version() }}"></script>{% endif %}
     {% if needsMotion|default(false) %}<script type="module" src="/assets/motion.js?v={{ kant_version() }}"></script>{% endif %}
     {% if needsScrolled|default(false) %}<script type="module" src="/assets/scrolled.js?v={{ kant_version() }}"></script>{% endif %}
     {% if needsZoom|default(false) %}<script src="/assets/lightbox.js?v={{ kant_version() }}" defer></script>{% endif %}
+    {% if not editing|default(false) %}{% for src in pluginScripts|default([]) %}<script src="{{ src }}" defer></script>{% endfor %}{% endif %}
     {# Own scripts of this page, as a file. Never rendered in the editor preview: the preview must
        show the layout, not run code that could change the page under the editor's hands. #}
     {% if pageScript|default(null) and not editing|default(false) %}<script src="{{ pageScript }}" defer></script>{% endif %}
+    {% if not editing|default(false) %}{% for src in areaScripts|default([]) %}<script src="{{ src }}" defer></script>{% endfor %}{% endif %}
     {# A data block, not a script: CSP script-src does not apply to application/ld+json. #}
     {% for block in structuredData|default([]) %}<script type="application/ld+json">{{ block|json_encode(constant('JSON_UNESCAPED_SLASHES') b-or constant('JSON_UNESCAPED_UNICODE') b-or constant('JSON_HEX_TAG') b-or constant('JSON_HEX_AMP'))|raw }}</script>
     {% endfor %}
@@ -78,7 +83,7 @@
        instead of being written into this template. #}
     {% if areas.header|default(null) %}
     <header class="site-header{{ siteSettings.load().stickyHeader ? ' is-sticky' : '' }}{{ siteSettings.load().headerOverlay ? ' is-overlay' : '' }}{{ kant_header_surface(areas.header) ? ' has-own-surface' : '' }}">
-        {% for block in areas.header.blocks %}{% include 'blocks/block.html.twig' with {block: block, editing: editing|default(false), postLists: {}, forms: {}, breadcrumbs: [], navigation: navigation|default({}), sections: sections|default({}), richText: areas.header.schemaVersion|default(1) >= 12, richHeadings: areas.header.schemaVersion|default(1) >= 17, eagerImage: eagerImage|default(null), inHeader: true} only %}{% endfor %}
+        {% for block in areas.header.blocks %}{% include 'blocks/block.html.twig' with {block: block, editing: editing|default(false), postLists: postLists|default({}), forms: forms|default({}), breadcrumbs: breadcrumbs|default([]), navigation: navigation|default({}), sections: sections|default({}), richText: areas.header.schemaVersion|default(1) >= 12, richHeadings: areas.header.schemaVersion|default(1) >= 17, eagerImage: eagerImage|default(null), inHeader: true} only %}{% endfor %}
     </header>
     {% endif %}
     <main id="main" tabindex="-1">
@@ -94,7 +99,7 @@
     </main>
     {% if areas.footer|default(null) %}
     <footer class="site-footer">
-        {% for block in areas.footer.blocks %}{% include 'blocks/block.html.twig' with {block: block, editing: editing|default(false), postLists: {}, forms: {}, breadcrumbs: [], navigation: navigation|default({}), sections: sections|default({}), richText: areas.footer.schemaVersion|default(1) >= 12, richHeadings: areas.footer.schemaVersion|default(1) >= 17, eagerImage: null} only %}{% endfor %}
+        {% for block in areas.footer.blocks %}{% include 'blocks/block.html.twig' with {block: block, editing: editing|default(false), postLists: postLists|default({}), forms: forms|default({}), breadcrumbs: breadcrumbs|default([]), navigation: navigation|default({}), sections: sections|default({}), richText: areas.footer.schemaVersion|default(1) >= 12, richHeadings: areas.footer.schemaVersion|default(1) >= 17, eagerImage: null} only %}{% endfor %}
     </footer>
     {% endif %}
     {% if not editing|default(false) and consentGate.needsBanner(app.request) %}