```

feat(public): 实现docx库按需加载并优化邮件配置存储逻辑

将Word导出功能中的docx库从静态引入改为按需动态加载，提升页面初始加载性能。
同时重构邮件配置功能，支持将配置保存至服务器并与localStorage保持同步备份。
此外，在页面初始化时并行加载各项配置以提高整体加载效率。
```

public/app.js

@@ -202,10 +202,34 @@ function displayReport(report, container) {
 async function exportReport() {
     if (!currentReport) return;
 
-    // 检查docx库是否加载
+    // 按需动态加载docx库
     if (!window.docx) {
-        alert('Word导出库正在加载中,请稍后再试...');
-        return;
+        try {
+            // 显示加载提示
+            const loadingMsg = document.createElement('div');
+            loadingMsg.textContent = '正在加载导出库...';
+            loadingMsg.style.cssText = 'position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:#fff;padding:20px;border-radius:8px;box-shadow:0 4px 12px rgba(0,0,0,0.15);z-index:9999;';
+            document.body.appendChild(loadingMsg);
+
+            // 动态加载docx库
+            await new Promise((resolve, reject) => {
+                const script = document.createElement('script');
+                script.src = 'https://cdn.jsdelivr.net/npm/docx@7.8.2/build/index.js';
+                script.onload = resolve;
+                script.onerror = () => {
+                    // 降级到unpkg
+                    script.src = 'https://unpkg.com/docx@7.8.2/build/index.js';
+                    script.onload = resolve;
+                    script.onerror = reject;
+                };
+                document.head.appendChild(script);
+            });
+
+            document.body.removeChild(loadingMsg);
+        } catch (error) {
+            alert('导出库加载失败,请检查网络连接后重试');
+            return;
+        }
     }
 
     const report = currentReport;
@@ -356,8 +380,8 @@ async function exportReport() {
 
 // ========== 邮件功能 ==========
 
-// 保存邮件配置到localStorage
-function saveEmailConfig() {
+// 保存邮件配置到服务器
+async function saveEmailConfig() {
     const config = {
         smtpHost: document.getElementById('smtpHost').value,
         smtpPort: parseInt(document.getElementById('smtpPort').value) || 587,
@@ -367,29 +391,107 @@ function saveEmailConfig() {
     };
 
     // 验证配置
-    if (!config.smtpHost || !config.smtpUser || !config.smtpPass || !config.recipients) {
-        showEmailStatus('请填写所有必填项', 'error');
+    if (!config.smtpHost || !config.smtpUser || !config.recipients) {
+        showEmailStatus('请填写SMTP服务器、发件人邮箱和收件人', 'error');
         return;
     }
 
-    // 保存到localStorage
-    localStorage.setItem('emailConfig', JSON.stringify(config));
-    showEmailStatus('邮件配置已保存', 'success');
+    // 如果密码为空,可能是要保持原密码不变
+    const smtpPassInput = document.getElementById('smtpPass');
+    if (!config.smtpPass && smtpPassInput.placeholder.includes('已配置')) {
+        // 使用占位符表示保持原密码
+        config.smtpPass = '***已配置***';
+    } else if (!config.smtpPass) {
+        showEmailStatus('请填写SMTP密码', 'error');
+        return;
+    }
+
+    showEmailStatus('正在保存配置...', 'info');
+
+    try {
+        // 先获取当前服务器配置
+        const getResponse = await fetch(`${API_BASE}/config`);
+        const getData = await getResponse.json();
+
+        let fullConfig = { email: config };
+
+        // 如果服务器有其他配置(如scheduler),保留它们
+        if (getData.success && getData.data) {
+            fullConfig = {
+                ...getData.data,
+                email: config
+            };
+        }
+
+        // 保存到服务器
+        const saveResponse = await fetch(`${API_BASE}/config`, {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify(fullConfig)
+        });
+
+        const saveData = await saveResponse.json();
+
+        if (saveData.success) {
+            // 同时保存到localStorage作为备份
+            localStorage.setItem('emailConfig', JSON.stringify(config));
+            showEmailStatus('邮件配置已保存到服务器', 'success');
+        } else {
+            showEmailStatus(`保存失败: ${saveData.error}`, 'error');
+        }
+    } catch (error) {
+        showEmailStatus(`保存失败: ${error.message}`, 'error');
+    }
 }
 
-// 从localStorage加载邮件配置
-function loadEmailConfig() {
-    const configStr = localStorage.getItem('emailConfig');
-    if (configStr) {
-        try {
-            const config = JSON.parse(configStr);
+// 从服务器加载邮件配置
+async function loadEmailConfig() {
+    try {
+        // 从服务器获取配置
+        const response = await fetch(`${API_BASE}/config`);
+        const data = await response.json();
+
+        if (data.success && data.data && data.data.email) {
+            const config = data.data.email;
             document.getElementById('smtpHost').value = config.smtpHost || '';
             document.getElementById('smtpPort').value = config.smtpPort || 587;
             document.getElementById('smtpUser').value = config.smtpUser || '';
-            document.getElementById('smtpPass').value = config.smtpPass || '';
+            // 如果密码是占位符,保持输入框为空或显示占位符
+            document.getElementById('smtpPass').value = config.smtpPass === '***已配置***' ? '' : (config.smtpPass || '');
+            if (config.smtpPass === '***已配置***') {
+                document.getElementById('smtpPass').placeholder = '***已配置*** (留空保持不变)';
+            }
             document.getElementById('recipients').value = config.recipients || '';
-        } catch (e) {
-            console.error('加载邮件配置失败:', e);
+
+            // 同时保存到localStorage作为备份
+            localStorage.setItem('emailConfig', JSON.stringify(config));
+        } else {
+            // 如果服务器没有配置,尝试从localStorage加载
+            const configStr = localStorage.getItem('emailConfig');
+            if (configStr) {
+                const config = JSON.parse(configStr);
+                document.getElementById('smtpHost').value = config.smtpHost || '';
+                document.getElementById('smtpPort').value = config.smtpPort || 587;
+                document.getElementById('smtpUser').value = config.smtpUser || '';
+                document.getElementById('smtpPass').value = config.smtpPass || '';
+                document.getElementById('recipients').value = config.recipients || '';
+            }
+        }
+    } catch (error) {
+        console.error('从服务器加载邮件配置失败:', error);
+        // 失败时尝试从localStorage加载
+        const configStr = localStorage.getItem('emailConfig');
+        if (configStr) {
+            try {
+                const config = JSON.parse(configStr);
+                document.getElementById('smtpHost').value = config.smtpHost || '';
+                document.getElementById('smtpPort').value = config.smtpPort || 587;
+                document.getElementById('smtpUser').value = config.smtpUser || '';
+                document.getElementById('smtpPass').value = config.smtpPass || '';
+                document.getElementById('recipients').value = config.recipients || '';
+            } catch (e) {
+                console.error('从localStorage加载邮件配置失败:', e);
+            }
         }
     }
 }
@@ -675,8 +777,13 @@ function updateCustomCron() {
 }
 
 document.addEventListener('DOMContentLoaded', function() {
-    loadEmailConfig();
-    loadSchedulerConfig();
+    // 并行加载配置,提高加载速度
+    Promise.all([
+        loadEmailConfig().catch(err => console.error('加载邮件配置失败:', err)),
+        loadSchedulerConfig().catch(err => console.error('加载定时任务配置失败:', err))
+    ]).then(() => {
+        console.log('配置加载完成');
+    });
 
     // 添加自定义时间输入框的事件监听
     const customHour = document.getElementById('customHour');