style: 将首页备案号移到右下角，并在底栏和全局页脚新增联系邮箱

client/src/components/Footer.jsx

@@ -9,6 +9,9 @@ export default function Footer() {
         <span style={styles.copyright}>
           © {currentYear} To Docx. 保留所有权利。
         </span>
+        <span style={{ color: '#9ca3af' }}>
+          联系邮箱: <a href="mailto:abigwc@163.com" style={styles.link} onMouseOver={(e) => e.target.style.color = '#3b82f6'} onMouseOut={(e) => e.target.style.color = '#9ca3af'}>abigwc@163.com</a>
+        </span>
         <a 
           href="https://beian.miit.gov.cn/" 
           target="_blank" 

client/src/pages/MD2Doc.jsx

@@ -689,7 +689,7 @@ export default function MD2Doc() {
         </main>
 
         <div style={styles.bottomBar}>
-          <div style={{ display: 'flex', flexDirection: 'column', alignItems: 'center', gap: '8px' }}>
+          <div style={{ position: 'relative', width: '100%', display: 'flex', justifyContent: 'center', alignItems: 'center' }}>
             <button
               style={styles.mainExportBtn}
               onClick={handleExportWord}
@@ -697,7 +697,11 @@ export default function MD2Doc() {
             >
               {exporting ? '正在生成文档...' : '一键导出 Word 文档 (.docx)'}
             </button>
-            <div style={{ fontSize: '12px', marginTop: '4px' }}>
+            
+            <div style={{ position: 'absolute', right: '24px', display: 'flex', flexDirection: 'column', alignItems: 'flex-end', gap: '4px', fontSize: '12px' }}>
+              <span style={{ color: '#9ca3af' }}>
+                联系邮箱: <a href="mailto:abigwc@163.com" style={{ color: '#9ca3af', textDecoration: 'none', transition: 'color 0.2s' }} onMouseOver={(e) => e.target.style.color = '#3b82f6'} onMouseOut={(e) => e.target.style.color = '#9ca3af'}>abigwc@163.com</a>
+              </span>
               <a 
                 href="https://beian.miit.gov.cn/" 
                 target="_blank"