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/js/credits.js

@@ -180,6 +180,28 @@
 		refresh();
 	}
 
+	// Task-list "去签到" → scroll + click the real asset-card sign-in button.
+	function initSigninGoto() {
+		document.querySelectorAll('[data-aksrt-signin-goto]').forEach(function (el) {
+			el.addEventListener('click', function (e) {
+				e.preventDefault();
+				var root = document.querySelector('[data-aksrt-signin]');
+				var btn = root ? root.querySelector('[data-signin-btn]') : null;
+				if (!btn) return;
+				try {
+					if (root && typeof root.scrollIntoView === 'function') {
+						root.scrollIntoView({ behavior: 'smooth', block: 'center' });
+					}
+				} catch (_) {}
+				if (!btn.disabled) {
+					btn.click();
+				} else {
+					btn.focus();
+				}
+			});
+		});
+	}
+
 	// ===== 邀请 =====
 	function initInvite() {
 		var root = document.querySelector('[data-aksrt-invite]');
@@ -944,6 +966,7 @@
 
 	function bootAssets() {
 		initSignin();
+		initSigninGoto();
 		initInvite();
 		initVipShop();
 		initVipPointsExchange();