feat: 企业微信机器人集成到后端服务，网页端可配置和重启

- BotManager: 后端启动时自动检测配置并拉起机器人（后台线程）
- WeComBotService: 新增 start_async() 异步模式，支持嵌入事件循环
- settings API: 增加 bot 配置字段（enabled/bot_id/secret）
- settings API: 增加 bot/status 和 bot/restart 端点
- 前端设置页: 增加企业微信机器人配置卡片（启用开关/ID/Secret）
- 前端设置页: 增加机器人状态徽章和重启按钮
- Secret 脱敏显示，仅展示前4位

static/index.html

@@ -1041,6 +1041,38 @@
                     </div>
                 </div>
 
+                <!-- 企业微信机器人 -->
+                <div class="card" style="margin-bottom:16px;">
+                    <div style="display:flex; align-items:center; justify-content:space-between; margin-bottom:16px;">
+                        <h3 class="section-title" style="margin-bottom:0;">企业微信机器人</h3>
+                        <div style="display:flex; align-items:center; gap:8px;">
+                            <span id="bot-status-badge" class="badge badge-pending">检测中</span>
+                            <button class="btn btn-secondary" onclick="restartBot()" id="bot-restart-btn" style="font-size:13px; padding:4px 12px;">重启机器人</button>
+                        </div>
+                    </div>
+                    <div style="display:grid; grid-template-columns:1fr 1fr; gap:0 24px;">
+                        <div class="form-group">
+                            <label class="form-label">启用机器人</label>
+                            <label style="display:flex; align-items:center; gap:8px; cursor:pointer; padding:6px 0;">
+                                <input type="checkbox" id="setting-wework-bot-enabled" onchange="toggleBotEnabled()" style="width:16px; height:16px;">
+                                <span style="font-size:13px; color:var(--text-secondary);">启用后服务启动时自动连接</span>
+                            </label>
+                        </div>
+                        <div class="form-group">
+                            <label class="form-label">Bot ID</label>
+                            <input type="text" id="setting-wework-bot-id" placeholder="企业微信机器人 ID" class="input-field">
+                        </div>
+                        <div class="form-group">
+                            <label class="form-label">Secret</label>
+                            <input type="password" id="setting-wework-bot-secret" placeholder="企业微信机器人 Secret" class="input-field">
+                        </div>
+                        <div class="form-group">
+                            <label class="form-label">服务地址</label>
+                            <input type="text" id="setting-edubrain-base-url" value="http://localhost:8765" class="input-field" style="color:var(--text-secondary); font-size:13px;" readonly>
+                        </div>
+                    </div>
+                </div>
+
                 <!-- 图片搜索设置 -->
                 <div class="card" style="margin-bottom:16px;">
                     <h3 class="section-title">图片搜索设置</h3>
@@ -2612,12 +2644,22 @@
             if (data.judge_batch_size != null) {
                 document.getElementById('setting-judge-batch-size').value = data.judge_batch_size;
             }
+            // 企业微信机器人
+            document.getElementById('setting-wework-bot-enabled').checked = data.wework_bot_enabled;
+            document.getElementById('setting-wework-bot-id').value = data.wework_bot_id || '';
+            // secret 只显示脱敏值作为 placeholder
+            const secretInput = document.getElementById('setting-wework-bot-secret');
+            if (data.wework_bot_secret_masked) {
+                secretInput.placeholder = '当前: ' + data.wework_bot_secret_masked;
+            }
         } catch (_) {
             // 静默处理
         }
         // 初始化字段显示状态
         toggleEmbedFields();
         toggleOcrFields();
+        // 加载机器人状态
+        loadBotStatus();
     }
 
     /** 保存设置 */
@@ -2631,6 +2673,12 @@
         if (!isNaN(judgeBatchSize) && judgeBatchSize >= 1 && judgeBatchSize <= 50) {
             body.judge_batch_size = judgeBatchSize;
         }
+        // 企业微信机器人
+        body.wework_bot_enabled = document.getElementById('setting-wework-bot-enabled').checked;
+        const botId = document.getElementById('setting-wework-bot-id').value.trim();
+        if (botId) body.wework_bot_id = botId;
+        const botSecret = document.getElementById('setting-wework-bot-secret').value.trim();
+        if (botSecret) body.wework_bot_secret = botSecret;
         if (Object.keys(body).length === 0) {
             showToast('没有需要保存的更改', 'info');
             return;
@@ -2643,6 +2691,53 @@
         }
     }
 
+    /** 加载机器人状态 */
+    async function loadBotStatus() {
+        try {
+            const data = await api('GET', '/settings/bot/status');
+            const badge = document.getElementById('bot-status-badge');
+            if (data.running) {
+                badge.className = 'badge badge-completed';
+                badge.textContent = '运行中';
+            } else if (data.configured) {
+                badge.className = 'badge badge-failed';
+                badge.textContent = '已停止';
+            } else {
+                badge.className = 'badge badge-pending';
+                badge.textContent = '未配置';
+            }
+        } catch (_) {
+            document.getElementById('bot-status-badge').className = 'badge badge-pending';
+            document.getElementById('bot-status-badge').textContent = '未知';
+        }
+    }
+
+    /** 重启企业微信机器人 */
+    async function restartBot() {
+        const btn = document.getElementById('bot-restart-btn');
+        btn.disabled = true;
+        btn.textContent = '重启中...';
+        try {
+            const result = await api('POST', '/settings/bot/restart');
+            if (result.success) {
+                showToast(result.message, 'success');
+            } else {
+                showToast(result.message, 'error');
+            }
+            setTimeout(() => loadBotStatus(), 2000);
+        } catch (err) {
+            showToast('重启失败: ' + err.message, 'error');
+        } finally {
+            btn.disabled = false;
+            btn.textContent = '重启机器人';
+        }
+    }
+
+    /** 切换机器人启用状态 */
+    function toggleBotEnabled() {
+        // 仅切换 UI 状态，实际保存需要点"保存设置"
+    }
+
     /** 测试嵌入模型连接 */
     async function testEmbedding() {
         showToast('正在测试嵌入模型连接...', 'info');