feat: VivesPOS landing on Winter CMS 1.2 — theme + plugin + Dockerfile

- Base: wintercms/winter branch 1.2 (full framework)
- Theme vivespos: Canvas 7 + Bootstrap 5 CDN, custom CSS
- Layout: deferred GTM/GA4 tracking, JSON-LD SoftwareApplication
- Partials: hero (offline-first), features, modes (offline/nube toggle),
  screenshots, pricing (3 planes), comparison, FAQ, CTA
- Plugin VivesPOS.Site with ContactForm
- Dockerfile: PHP 8.2 Apache, port 80, healthcheck
- Added winter/wn-pages, blog, sitemap, seo plugins
- Active theme set to vivespos

modules/backend/layouts/_sidenav.php

@@ -0,0 +1,53 @@
+<?php
+    $context = BackendMenu::getContext();
+    $contextSidenav = BackendMenu::getContextSidenavPartial($context->owner, $context->mainMenuCode);
+?>
+<?php if (!$contextSidenav): ?>
+    <?php
+        $sideMenuItems = BackendMenu::listSideMenuItems();
+    ?>
+    <?php if ($sideMenuItems): ?>
+        <div class="layout-cell layout-sidenav-container">
+            <div class="layout-relative">
+                <nav
+                    id="layout-sidenav"
+                    class="layout-sidenav bg-p"
+                    data-active-class="active"
+                    data-control="sidenav">
+                    <ul class="nav">
+                        <?php foreach ($sideMenuItems as $sideItemCode => $item): ?>
+                            <li
+                                class="<?= BackendMenu::isSideMenuItemActive($item) ? 'active' : null ?>"
+                                <?= Html::attributes($item->attributes) ?>
+                            >
+                                <a href="<?= $item->url ?>">
+                                    <span class="nav-icon">
+                                        <?php if ($item->iconSvg): ?>
+                                            <img class="svg-icon" src="<?= Url::asset($item->iconSvg) ?>">
+                                        <?php endif ?>
+
+                                        <i class="<?= $item->iconSvg ? 'svg-replace' : null ?> <?= $item->icon ?>"></i>
+                                    </span>
+                                    <span class="nav-label">
+                                        <?= e(trans($item->label)) ?>
+                                    </span>
+                                </a>
+                                <span
+                                    class="counter <?= $item->counter === null ? 'empty' : null ?>"
+                                    data-menu-id="<?= e($context->mainMenuCode.'/'.$sideItemCode) ?>"
+                                    <?php if ($item->counterLabel): ?>
+                                        title="<?= e(trans($item->counterLabel)) ?>"
+                                    <?php endif ?>
+                                >
+                                    <?= e($item->counter) ?>
+                                </span>
+                            </li>
+                        <?php endforeach ?>
+                    </ul>
+                </nav>
+            </div>
+        </div>
+    <?php endif ?>
+<?php else: ?>
+    <?= $this->makePartial($contextSidenav) ?>
+<?php endif ?>