feat: 实现文章点赞功能及相关API和UI组件

- 新增点赞功能API接口及数据库表结构
- 添加点赞状态管理及UI交互组件
- 实现点赞统计和列表查询功能
- 优化评论组件布局，将点赞按钮加入头部区域

docs/widget/src/styles/main.css

@@ -39,6 +39,21 @@
   color: var(--cwd-text);
 }
 
+.cwd-comments-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 16px 0;
+  margin-bottom: 16px;
+  border-bottom: 1px solid var(--cwd-border);
+}
+
+.cwd-comments-count {
+  font-size: 16px;
+  font-weight: 600;
+  color: var(--cwd-text);
+}
+
 /* ========== Loading 组件 ========== */
 .cwd-loading {
   display: flex;
@@ -499,6 +514,72 @@
   height: auto;
 }
 
+.cwd-like {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.cwd-like-button {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  padding: 4px 10px;
+  border-radius: 999px;
+  border: 1px solid var(--cwd-border-light, #eaeef2);
+  background: var(--cwd-bg-secondary, #f6f8fa);
+  color: var(--cwd-text-secondary, #6e7781);
+  cursor: pointer;
+  font-size: 13px;
+  font-family: inherit;
+  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.15s ease;
+}
+
+.cwd-like-button[data-liked='true'] {
+  background: rgba(9, 105, 218, 0.08);
+  border-color: var(--cwd-primary, #0969da);
+  color: var(--cwd-primary, #0969da);
+}
+
+.cwd-like-button[data-loading='true'] {
+  opacity: 0.6;
+  cursor: default;
+  pointer-events: none;
+}
+
+.cwd-like-icon-wrapper {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.cwd-like-icon {
+  width: 18px;
+  height: 18px;
+  fill: currentColor;
+}
+
+.cwd-like-count {
+  min-width: 1.5em;
+  text-align: right;
+}
+
+.cwd-like-animate .cwd-like-icon {
+  animation: cwd-like-bounce 0.3s ease;
+}
+
+@keyframes cwd-like-bounce {
+  0% {
+    transform: scale(1);
+  }
+  50% {
+    transform: scale(1.2);
+  }
+  100% {
+    transform: scale(1.05);
+  }
+}
+
 .cwd-comment-actions {
   display: flex;
   align-items: center;