前端增加人工互联网搜索功能

- 新增互联网搜索面板，支持手动输入关键词搜索
- 搜索结果展示为卡片形式，显示标题和链接
- 支持抓取单个结果的详细内容
- 可一键保存搜索结果到内容库
- 新增搜索 API 端点：/api/articles/internet-search
- 搜索结果详情模态框展示
- 响应式设计，搜索结果自适应布局

static/css/style.css

@@ -642,4 +642,97 @@ body {
 
 .priority-low {
     color: #10b981;
+}
+
+/* 搜索结果卡片 */
+.search-results-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
+    gap: 15px;
+}
+
+.search-result-card {
+    background: #f8f9fa;
+    border: 1px solid #e9ecef;
+    border-radius: 8px;
+    padding: 15px;
+    display: flex;
+    gap: 15px;
+    transition: all 0.2s;
+}
+
+.search-result-card:hover {
+    border-color: #667eea;
+    background: white;
+}
+
+.result-number {
+    width: 30px;
+    height: 30px;
+    background: #667eea;
+    color: white;
+    border-radius: 50%;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    font-weight: bold;
+    font-size: 14px;
+}
+
+.result-content {
+    flex: 1;
+    min-width: 0;
+}
+
+.result-title {
+    font-size: 15px;
+    color: #333;
+    cursor: pointer;
+    margin-bottom: 8px;
+    word-break: break-word;
+}
+
+.result-title:hover {
+    color: #667eea;
+}
+
+.result-url {
+    font-size: 12px;
+    color: #666;
+    margin-bottom: 6px;
+    overflow: hidden;
+}
+
+.result-url a {
+    color: #3b82f6;
+    text-decoration: none;
+    display: flex;
+    align-items: center;
+    gap: 4px;
+}
+
+.result-url a:hover {
+    text-decoration: underline;
+}
+
+.result-source {
+    font-size: 12px;
+    color: #999;
+}
+
+.result-actions {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+}
+
+/* 搜索状态 */
+#internet-search-status {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+}
+
+#internet-search-status i {
+    font-size: 16px;
 }