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

templates/index.html

@@ -116,6 +116,26 @@
             </div>
         </div>
 
+        <!-- 互联网搜索区域 -->
+        <div class="panel full-width">
+            <div class="panel-header">
+                <h2><i class="ri-search-line"></i> 互联网搜索</h2>
+                <div class="panel-actions">
+                    <input type="text" id="internet-search-keyword" placeholder="输入关键词搜索..." class="search-input" style="width: 300px;">
+                    <input type="number" id="internet-search-count" value="10" min="1" max="20" style="width: 80px;" title="结果数量">
+                    <button onclick="doInternetSearch()" class="btn btn-primary" id="search-btn">
+                        <i class="ri-search-line"></i> 搜索
+                    </button>
+                </div>
+            </div>
+            <div class="panel-body">
+                <div id="internet-search-status" style="margin-bottom: 10px; color: #666; font-size: 14px;"></div>
+                <div class="search-results-grid" id="internet-search-results">
+                    <div class="empty-text">输入关键词进行互联网搜索</div>
+                </div>
+            </div>
+        </div>
+
         <!-- 处理历史 -->
         <div class="panel full-width">
             <div class="panel-header">
@@ -267,6 +287,26 @@
         </div>
     </div>
 
+    <!-- 搜索结果详情模态框 -->
+    <div id="search-result-modal" class="modal">
+        <div class="modal-content large">
+            <div class="modal-header">
+                <h3><i class="ri-external-link-line"></i> 搜索结果详情</h3>
+                <button onclick="closeModal('search-result-modal')" class="close-btn">
+                    <i class="ri-close-line"></i>
+                </button>
+            </div>
+            <div class="modal-body" id="search-result-body">
+            </div>
+            <div class="modal-footer">
+                <button onclick="closeModal('search-result-modal')" class="btn btn-secondary">关闭</button>
+                <button onclick="saveSearchResultToLibrary()" class="btn btn-success">
+                    <i class="ri-save-line"></i> 保存到内容库
+                </button>
+            </div>
+        </div>
+    </div>
+
     <!-- 文章详情模态框 -->
     <div id="article-detail-modal" class="modal">
         <div class="modal-content large">