knowledgecenter: remove forum/product tabs and fix new-post errors

- post_cardform.php: remove Diskussion tab (forum module doesn't exist)
- post_cardform_contacts.php: guard get_contact_cards AJAX so it doesn't
  fire with post_id=0 on new posts (caused "Ungültige Beitrags-ID" error)
- post_cardform_settings.php: remove Produkte section entirely — the
  product/product_translation tables don't exist in this installation,
  which caused a fatal crash when opening the settings tab

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

module/knowledgecenter_update/Views/post_cardform.php

@@ -373,7 +373,6 @@ if ($resLinkedForm && mysqli_num_rows($resLinkedForm) > 0) {
             <a href="#tab-article" class="active"><?= $translation->get("wiki_post") ?></a>
             <a href="#tab-files"><?= $translation->get("files") ?> (<?php echo $fileCount; ?>)</a>
             <a href="#tab-contacts"><?= $translation->get("Ansprechpartner") ?> (<?php echo $contactCount; ?>)</a>
-            <a href="#tab-discussion"><?= $translation->get("Forum") ?> (<?php echo $commentCount; ?>)</a>
             <a href="#tab-versions"><?= $translation->get("version_history") ?> (<?php echo $versionCount; ?>)</a>
             <?php if (get_permission_state('r-wiki', $GLOBALS['main_contact']['master_mandant_id'], $GLOBALS['main_contact']['id']) == 1) { ?>
                 <a href="#tab-settings"><?= $translation->get("settings") ?></a>
@@ -437,18 +436,6 @@ if ($resLinkedForm && mysqli_num_rows($resLinkedForm) > 0) {
         require_once 'post_cardform_contacts.php';
         ?>
     </div>
-    <div id="tab-discussion" class="tab-content forum">
-        <?php
-        $forumView = __DIR__ . '/../../forum/Views/topic_listform.php';
-        if (!$isNew && $postId > 0 && file_exists($forumView)) {
-            $knowledgecenter_post_id = $postId;
-            require_once $forumView;
-        } else {
-            echo '<p style="color:#6b7280;font-style:italic;padding:16px;">Diskussionsfunktion noch nicht verfügbar.</p>';
-        }
-        ?>
-    </div>
-
     <!-- Tab Content: Versionsgeschichte -->
     <div id="tab-versions" class="tab-content">
         <?php

module/knowledgecenter_update/Views/post_cardform_contacts.php

@@ -91,6 +91,7 @@ if ($postId != 0) {
             });
     });
 
+    <?php if ($postId > 0): ?>
     // Direktes Laden und Anzeigen der Visitenkarten per AJAX beim Laden der Seite
     $(document).ready(function () {
         $.post("/module/knowledgecenter_update/Ajax/Ajax.php", {
@@ -108,4 +109,5 @@ if ($postId != 0) {
                 $("#contactCards").html('<p>Ein Fehler ist aufgetreten.</p>');
             });
     });
+    <?php endif; ?>
 </script>

module/knowledgecenter_update/Views/post_cardform_settings.php

@@ -163,32 +163,6 @@ if ($postId != 0) {
     }
 }
 
-// -------------------- Produkte für Post --------------------
-$productsData = [];
-$query = "SELECT p.id, pt.title
-          FROM product AS p
-          JOIN product_translation AS pt
-            ON p.id = pt.product_id
-          WHERE pt.language_id = $languageId";
-$result = mysqli_query($GLOBALS['mysql_con'], $query);
-while ($row = mysqli_fetch_assoc($result)) {
-    $productsData[] = ['value' => $row['id'], 'name' => $row['title']];
-}
-$selectedProducts = [];
-if ($postId != 0) {
-    $querySelected = "SELECT p.id, pt.title
-                      FROM product_knowledgecenter_post_link AS pl
-                      JOIN product AS p ON pl.product_id = p.id
-                      JOIN product_translation AS pt
-                        ON p.id = pt.product_id
-                      WHERE pl.post_id = $postId
-                        AND pt.language_id = $languageId";
-    $resultSelected = mysqli_query($GLOBALS['mysql_con'], $querySelected);
-    while ($row = mysqli_fetch_assoc($resultSelected)) {
-        $selectedProducts[] = ['value' => $row['id'], 'name' => $row['title']];
-    }
-}
-
 $postBackgroundColor = '#FFFFFF';
 if (!empty($post['background_color'])) {
     $postBackgroundColor = $post['background_color'];
@@ -269,11 +243,6 @@ if (!empty($post['text_color'])) {
             <input type="text" id="postFachbereichTags" name="postFachbereiche" placeholder="Fachbereich hinzufügen…" />
         </div>
 
-        <h3><?=$translation->get("products")?></h3>
-        <div class="settings_container">
-            <input type="text" id="postProductTags" name="postProducts" placeholder="<?=$translation->get("products")?>…" />
-        </div>
-
         <h3>Formular auswählen</h3>
         <div class="settings_container">
             <select name="postFormSelect" id="postFormSelect">
@@ -318,9 +287,6 @@ if (!empty($post['text_color'])) {
     var selectedPostRoles = <?php echo json_encode($selectedPostRoles); ?>;
     var selectedPostEinrichts = <?php echo json_encode($selectedPostEinrichts); ?>;
     var selectedPostFachbereiche = <?php echo json_encode($selectedPostFachbereiche); ?>;
-    var productsData = <?php echo json_encode($productsData); ?>;
-    var selectedProducts = <?php echo json_encode($selectedProducts); ?>;
-
     var categoryEnableColorMap = {};
     categoriesData.forEach(function (cat) {
         categoryEnableColorMap[String(cat.value)] = parseInt(cat.enable_post_color_pickers || 0, 10) === 1;
@@ -458,25 +424,6 @@ if (!empty($post['text_color'])) {
         tagifyPostFachbereiche.addTags(selectedPostFachbereiche);
     }
 
-    // Produkte für Post
-    var tagifyPostProducts = new Tagify(document.getElementById('postProductTags'), {
-        whitelist: productsData,
-        tagTextProp: 'name',
-        enforceWhitelist: true,
-        dropdown: { enabled: 0, maxItems: Infinity, searchKeys: ["name"] },
-        templates: {
-            dropdownItem: function (tagData) {
-                return `<div ${this.getAttributes(tagData)} class="tagify__dropdown__item">
-                        <span>${tagData.name}</span>
-                    </div>`;
-            }
-        }
-    });
-    if (selectedProducts.length) {
-        tagifyPostProducts.addTags(selectedProducts);
-    }
-
-
     <?php if (get_permission_state('r-wiki', $GLOBALS['main_contact']['master_mandant_id'], $GLOBALS['main_contact']['id']) == 1) { ?>
         $("#saveAllBtn").on("click", function () {
             // Während des Speicherns blurren
@@ -538,11 +485,6 @@ if (!empty($post['text_color'])) {
                     fachbereiche: JSON.stringify(selectedFachbereiche)
                 }, "json"),
 
-                $.post("/module/knowledgecenter_update/Ajax/Ajax.php", {
-                    action: "update_post_products",
-                    post_id: postId,
-                    products: JSON.stringify(tagifyPostProducts.value.map(tag => tag.value))
-                }, "json"),
                 $.post("/module/knowledgecenter_update/Ajax/Ajax.php", {
                     action: "update_post_pdf_inline",
                     post_id: postId,
@@ -554,7 +496,7 @@ if (!empty($post['text_color'])) {
                     background_color: postBackgroundColor,
                     text_color: postTextColor
                 }, "json")
-            ).done(function (categoriesResponse, mandantsResponse, formResponse, departmentsResponse, rolesResponse, einrichtsResponse, fachbereicheResponse, productsResponse, pdfInlineResponse, postColorsResponse) {
+            ).done(function (categoriesResponse, mandantsResponse, formResponse, departmentsResponse, rolesResponse, einrichtsResponse, fachbereicheResponse, pdfInlineResponse, postColorsResponse) {
                 var catSuccess = categoriesResponse[0].success;
                 var mandantsSuccess = mandantsResponse[0].success;
                 var formSuccess = formResponse[0].success;
@@ -562,11 +504,10 @@ if (!empty($post['text_color'])) {
                 var rolesSuccess = rolesResponse[0].success;
                 var einrichtsSuccess = einrichtsResponse[0].success;
                 var fachbereicheSuccess = fachbereicheResponse[0].success;
-                var productsSuccess = productsResponse[0].success;
                 var pdfInlineSuccess = pdfInlineResponse[0].success;
                 var postColorsSuccess = postColorsResponse[0].success;
 
-                if (catSuccess && mandantsSuccess && formSuccess && departmentsSuccess && rolesSuccess && einrichtsSuccess && fachbereicheSuccess && productsSuccess && pdfInlineSuccess && postColorsSuccess) {
+                if (catSuccess && mandantsSuccess && formSuccess && departmentsSuccess && rolesSuccess && einrichtsSuccess && fachbereicheSuccess && pdfInlineSuccess && postColorsSuccess) {
                     showMessage("Alle Daten erfolgreich gespeichert!", true);
                 } else {
                     var errorMsg = "Fehler beim Speichern:";
@@ -577,7 +518,6 @@ if (!empty($post['text_color'])) {
                     if (!rolesSuccess) errorMsg += " Rollen";
                     if (!einrichtsSuccess) errorMsg += " Einrichtungen";
                     if (!fachbereicheSuccess) errorMsg += " Fachbereiche";
-                    if (!productsSuccess) errorMsg += " Produkte";
                     if (!pdfInlineSuccess) errorMsg += " PDF Inline Vorschau";
                     if (!postColorsSuccess) errorMsg += " Farben";
                     showMessage(errorMsg, false);