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/formwidgets/fileupload/partials/_file_single.php

@@ -0,0 +1,80 @@
+<div
+    id="<?= $this->getId() ?>"
+    class="field-fileupload style-file-single <?= $singleFile ? 'is-populated' : '' ?> <?= $this->previewMode ? 'is-preview' : '' ?>"
+    data-control="fileupload"
+    data-upload-handler="<?= $this->getEventHandler('onUpload') ?>"
+    data-template="#<?= $this->getId('template') ?>"
+    data-error-template="#<?= $this->getId('errorTemplate') ?>"
+    data-max-filesize="<?= $maxFilesize ?>"
+    <?php if ($useCaption): ?>
+        data-config-handler="<?= $this->getEventHandler('onLoadAttachmentConfig') ?>"
+    <?php endif ?>
+    <?php if ($acceptedFileTypes): ?>
+        data-file-types="<?= $acceptedFileTypes ?>"
+    <?php endif ?>
+    <?= $this->formField->getAttributes() ?>
+>
+
+    <!-- Upload Button -->
+    <button type="button" class="btn btn-default upload-button">
+        <i class="<?= e($iconClass) ?>"></i>
+    </button>
+
+    <!-- Existing file -->
+    <div class="upload-files-container">
+        <?php if ($singleFile): ?>
+            <div class="upload-object is-success" data-id="<?= $singleFile->id ?>" data-path="<?= $singleFile->pathUrl ?>">
+                <div class="icon-container">
+                    <i class="icon-file"></i>
+                </div>
+                <div class="info">
+                    <h4 class="filename">
+                        <span data-dz-name><?= e($singleFile->title ?: $singleFile->file_name) ?></span>
+                    </h4>
+                    <p class="size"><?= e($singleFile->sizeToString()) ?></p>
+                </div>
+                <div class="meta">
+                    <a
+                        href="javascript:;"
+                        class="upload-remove-button"
+                        data-request="<?= $this->getEventHandler('onRemoveAttachment') ?>"
+                        data-request-confirm="<?= e(trans('backend::lang.fileupload.remove_confirm')) ?>"
+                        data-request-data="file_id: '<?= $singleFile->id ?>'"
+                        ><i class="icon-times"></i></a>
+                </div>
+            </div>
+        <?php endif ?>
+    </div>
+
+    <!-- Empty message -->
+    <div class="upload-empty-message">
+        <span class="text-muted"><?= $prompt ?></span>
+    </div>
+
+</div>
+
+<!-- Template for new file -->
+<script type="text/template" id="<?= $this->getId('template') ?>">
+    <div class="upload-object dz-preview dz-file-preview">
+        <div class="icon-container">
+            <i class="icon-file"></i>
+            <img data-dz-thumbnail alt="" />
+        </div>
+        <div class="info">
+            <h4 class="filename">
+                <span data-dz-name></span>
+            </h4>
+            <p class="size" data-dz-size></p>
+        </div>
+        <div class="meta">
+            <a
+                href="javascript:;"
+                class="upload-remove-button"
+                data-request="<?= $this->getEventHandler('onRemoveAttachment') ?>"
+                data-request-confirm="<?= e(trans('backend::lang.fileupload.remove_confirm')) ?>"
+                ><i class="icon-times"></i></a>
+            <div class="progress-bar"><span class="upload-progress" data-dz-uploadprogress></span></div>
+            <div class="error-message"><span data-dz-errormessage></span></div>
+        </div>
+    </div>
+</script>