feat(user-center): task list go-to actions for free points

Add per-task CTAs (去签到 / 去完成 / 去看看) on the free points tasks list,
with sign-in proxying to the asset-card button and bbs actions gated
on forum availability.

assets/css/routes/user-center/credits.css

@@ -965,4 +965,24 @@ body.uc-modal-open {
   cursor: pointer;
   padding: 0;
 }
+.uc-points-tasks__meta {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-end;
+  gap: 2px;
+}
+.uc-points-tasks__action {
+  display: inline-flex;
+  align-items: center;
+  text-decoration: none;
+  color: var(--muted-color, #8b9198);
+  background: none;
+  border: 0;
+  cursor: pointer;
+  padding: 0;
+  line-height: 1.4;
+}
+.uc-points-tasks__action:hover {
+  color: var(--focus-color, #f04494);
+}
 .focus-color { color: var(--focus-color, #f59e0b); }