feat(mp): 新增 AvatarCircle/ShortcutButton/TodoAlert 组件 + 商品详情页

- AvatarCircle: 头像圆形组件
- ShortcutButton: 快捷操作按钮
- TodoAlert: 待办提醒组件
- pkg-mall/product: 积分商品详情页

apps/miniprogram/src/components/ui/ShortcutButton/index.scss

@@ -0,0 +1,79 @@
+@import '../../../styles/variables.scss';
+
+.shortcut-btn {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 8px;
+  cursor: pointer;
+
+  &:active {
+    opacity: var(--tk-touch-feedback-opacity);
+  }
+
+  &__icon-wrap {
+    position: relative;
+    width: 52px;
+    height: 52px;
+    border-radius: 26px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    transition: transform 0.15s;
+  }
+
+  &__icon {
+    font-size: 22px;
+    line-height: 1;
+  }
+
+  &__badge {
+    position: absolute;
+    top: -4px;
+    right: -8px;
+    min-width: 18px;
+    height: 18px;
+    line-height: 18px;
+    text-align: center;
+    background: $dan;
+    color: $white;
+    font-size: 11px;
+    font-weight: 700;
+    border-radius: $r-pill;
+    padding: 0 4px;
+  }
+
+  &__label {
+    font-size: 12px;
+    color: $tx2;
+  }
+
+  // ── 色彩变体（对齐 SPEC T.priL/T.accL/T.wrnL/T.danL）──
+  &--pri .shortcut-btn__icon-wrap {
+    background: #D4E5F0;
+  }
+  &--pri .shortcut-btn__icon {
+    color: #3A6B8C;
+  }
+
+  &--acc .shortcut-btn__icon-wrap {
+    background: #E8F0E8;
+  }
+  &--acc .shortcut-btn__icon {
+    color: #5B7A5E;
+  }
+
+  &--wrn .shortcut-btn__icon-wrap {
+    background: #FFF3E0;
+  }
+  &--wrn .shortcut-btn__icon {
+    color: #C4873A;
+  }
+
+  &--dan .shortcut-btn__icon-wrap {
+    background: #FDEAEA;
+  }
+  &--dan .shortcut-btn__icon {
+    color: #B54A4A;
+  }
+}