fix(polish): 订单购物车论坛粉边软化 + 论坛付费帖购链路

- 购物车/商品/论坛表面复用 #77 soft recipe（mix 边 + soft ring）
- 论坛 visibility=pay：订单 resource + 余额扣费闭环
- VIP 价/免费解锁 + 购买 CTA/AJAX，复用现有 Order/Credits

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

assets/css/frontend/forum/extras/additional-role-badges.css

@@ -43,7 +43,7 @@
 }
 
 .aksrt-forum-reply.is-pinned {
-    border-left: 3px solid #1890ff;
+    border-left: 3px solid color-mix(in srgb, var(--color-primary) 55%, transparent);
 }
 
 .aksrt-forum-reply.is-pinned.is-hot {

assets/css/frontend/forum/extras/base.css

@@ -253,7 +253,7 @@
 
 .aksrt-forum-topic__badge--question {
     background: #e6f7ff;
-    color: #1890ff;
+    color: var(--color-primary);
 }
 
 .aksrt-forum-topic__badge--solved {
@@ -263,7 +263,7 @@
 
 .aksrt-forum-topic-item__badge--question {
     background: #e6f7ff;
-    color: #1890ff;
+    color: var(--color-primary);
 }
 
 .aksrt-forum-topic-item__badge--solved {
@@ -328,8 +328,8 @@
 }
 
 .aksrt-forum-topic__score-btn:hover:not(:disabled) {
-    border-color: var(--color-primary, #1890ff);
-    color: var(--color-primary, #1890ff);
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
+    color: var(--color-primary);
 }
 
 .aksrt-forum-topic__score-btn--up:hover:not(:disabled) {
@@ -372,7 +372,7 @@
 .aksrt-forum-topic__vote-type-badge {
     display: inline-block;
     padding: 1px 6px;
-    background: var(--color-primary, #1890ff);
+    background: var(--color-primary);
     color: #fff;
     border-radius: var(--radius-pill, 999px);
     font-size: 11px;
@@ -401,7 +401,7 @@
 
 .aksrt-forum-topic__chip--topic-cat {
     background: var(--color-primary-bg, #e6f7ff);
-    color: var(--color-primary, #1890ff);
+    color: var(--color-primary);
     font-weight: 600;
 }
 

assets/css/frontend/forum/extras/like-button.css

@@ -14,11 +14,11 @@
 }
 
 .aksrt-forum-reply__like-btn:hover {
-    color: var(--c-primary, #1890ff);
+    color: var(--color-primary);
 }
 
 .aksrt-forum-reply__like-btn.is-active {
-    color: var(--c-primary, #1890ff);
+    color: var(--color-primary);
 }
 
 .aksrt-forum-reply__like-count {

assets/css/frontend/forum/extras/load-more.css

@@ -17,7 +17,7 @@
 }
 
 .aksrt-forum-replies__more-btn:hover {
-    border-color: var(--c-primary, #1890ff);
-    color: var(--c-primary, #1890ff);
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
+    color: var(--color-primary);
 }
 

assets/css/frontend/forum/extras/quick-post-bar.css

@@ -19,8 +19,8 @@
 }
 
 .aksrt-forum-quick-post__input:hover {
-    border-color: var(--c-primary, #1890ff);
-    box-shadow: 0 0 0 2px rgba(24, 144, 255, .1);
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
+    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 18%, transparent);
 }
 
 .aksrt-forum-quick-post__input img {

assets/css/frontend/forum/extras/reply-action-buttons.css

@@ -16,7 +16,7 @@
 
 .aksrt-forum-reply__reply-btn:hover,
 .aksrt-forum-reply__top-btn:hover {
-    color: var(--c-primary, #1890ff);
+    color: var(--color-primary);
 }
 
 /* ── §7.3 Hidden content block [aksrt_hide] ── */
@@ -80,13 +80,13 @@
 
 .aksrt-forum-home-tabs__btn:hover {
     color: var(--c-text-1, #333);
-    border-color: var(--c-primary, #1890ff);
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
 }
 
 .aksrt-forum-home-tabs__btn.is-active {
-    background: var(--c-primary, #1890ff);
+    background: var(--color-primary);
     color: #fff;
-    border-color: var(--c-primary, #1890ff);
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
 }
 
 .aksrt-forum-home-tabs__badge {

assets/css/frontend/forum/extras/reply-header-tabs-filters.css

@@ -30,13 +30,13 @@
 
 .aksrt-forum-replies__tab:hover {
     color: var(--c-text-1, #333);
-    border-color: var(--c-primary, #1890ff);
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
 }
 
 .aksrt-forum-replies__tab.is-active {
-    background: var(--c-primary, #1890ff);
+    background: var(--color-primary);
     color: #fff;
-    border-color: var(--c-primary, #1890ff);
+    border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line, #e5e7eb));
 }
 
 .aksrt-forum-replies__filter {