feat(forum,admin): plate follow-pay MVP, sales column, order type tabs

Wire paid plate follow (admin meta + points/balance purchase + AJAX),
re-check plate gate on topics, post list sales column, and order type
subtabs; update gap matrix and admin IA map.

assets/js/forum-governance.js

@@ -718,6 +718,110 @@
         });
     }
 
+    function formatFollowPayLabel(pay) {
+        pay = pay || {};
+        if (pay.is_free) {
+            return 'VIP 免费关注';
+        }
+        if (pay.label) {
+            return String(pay.label);
+        }
+        if (pay.modo === 'points') {
+            return String(pay.amount || 0) + ' 积分';
+        }
+        return '¥' + String(pay.amount || '0');
+    }
+
+    function purchasePlateFollow(plateId, button, payHint) {
+        var confirmMsg = '确认付费关注该版块？';
+        if (payHint && payHint.is_free) {
+            confirmMsg = '确认使用 VIP 免费关注该版块？';
+        } else if (payHint) {
+            confirmMsg = '确认支付 ' + formatFollowPayLabel(payHint) + ' 关注该版块？';
+        }
+        if (!window.confirm(confirmMsg)) {
+            button.disabled = false;
+            return;
+        }
+
+        var data = new FormData();
+        data.append('action', 'aksrt_forum_purchase_plate_follow');
+        data.append('plate_id', plateId);
+        data.append('_nonce', rootData.forumNonce || '');
+
+        fetch((rootData.ajaxUrl || '/wp-admin/admin-ajax.php'), {
+            method: 'POST',
+            body: data,
+            credentials: 'same-origin',
+        }).then(function (r) { return r.json(); }).then(function (payload) {
+            if (!payload.success) {
+                throw new Error((payload.data && payload.data.message) || '支付失败');
+            }
+            var res = payload.data || {};
+            button.setAttribute('data-followed', '1');
+            button.classList.add('is-followed');
+            var label = button.querySelector('span') || button;
+            if (button.querySelector('i') && button.childNodes.length) {
+                // keep icon, replace trailing text via last text-ish content
+                button.innerHTML = '<i class="fas fa-heart"></i> 已关注';
+            } else {
+                button.textContent = '已关注';
+            }
+            if (typeof window.aksrtToast === 'function') {
+                window.aksrtToast(res.message || '关注成功', 'success');
+            }
+            setTimeout(function () { window.location.reload(); }, 600);
+        }).catch(function (error) {
+            var msg = error.message || '支付失败';
+            if (typeof window.aksrtToast === 'function') { window.aksrtToast(msg, 'error'); }
+            else { window.alert(msg); }
+            button.disabled = false;
+        });
+    }
+
+    function bindFollowPlateButton(button) {
+        button.addEventListener('click', function () {
+            var plateId = parseInt(button.getAttribute('data-plate-id') || '0', 10);
+            if (!plateId || button.disabled) {
+                return;
+            }
+            button.disabled = true;
+
+            var data = new FormData();
+            data.append('action', 'aksrt_forum_follow_plate');
+            data.append('plate_id', plateId);
+            data.append('_nonce', rootData.forumNonce || '');
+
+            fetch((rootData.ajaxUrl || '/wp-admin/admin-ajax.php'), {
+                method: 'POST',
+                body: data,
+                credentials: 'same-origin',
+            }).then(function (r) { return r.json(); }).then(function (payload) {
+                // Paid follow required
+                if (!payload.success && payload.data && payload.data.require_pay) {
+                    purchasePlateFollow(plateId, button, payload.data.pay || {});
+                    return;
+                }
+                if (!payload.success) {
+                    throw new Error((payload.data && payload.data.message) || '操作失败');
+                }
+                var res = payload.data || {};
+                var followed = !!res.followed;
+                button.setAttribute('data-followed', followed ? '1' : '0');
+                button.classList.toggle('is-followed', followed);
+                button.innerHTML = followed
+                    ? '<i class="fas fa-heart"></i> 已关注'
+                    : '<i class="fas fa-heart"></i> 关注';
+                button.disabled = false;
+            }).catch(function (error) {
+                var msg = error.message || '操作失败';
+                if (typeof window.aksrtToast === 'function') { window.aksrtToast(msg, 'error'); }
+                else { window.alert(msg); }
+                button.disabled = false;
+            });
+        });
+    }
+
     function bindComposeCoverToggle(form) {
         var coverTypeSelect = form.querySelector('#compose-cover-type');
         var imageField = form.querySelector('#compose-cover-image-field');
@@ -1455,6 +1559,7 @@
         document.querySelectorAll('.js-aksrt-adopt-answer').forEach(bindAdoptButton);
         document.querySelectorAll('.js-aksrt-unlock-topic').forEach(bindUnlockButton);
         document.querySelectorAll('.js-aksrt-purchase-topic').forEach(bindPurchaseButton);
+        document.querySelectorAll('.js-aksrt-follow-plate').forEach(bindFollowPlateButton);
         bindForumCommentEngine();
         bindForumHomeTabs();
         bindBoardSortTabs();