feat: fix backend sql error;fix frontend i18n display error

backend/app.js

@@ -100,7 +100,7 @@ app.delete('/api/messages', async (req, res) => {
     return res.status(400).send('Recipient is required');
   }
   try {
-    await db.execute('DELETE FROM emails WHERE recipient = ?', [recipient]);
+    await db.execute('DELETE FROM emails WHERE recipient LIKE ?', [`%${recipient}%`]);
     logger.info('All messages for recipient deleted successfully', { recipient });
     res.status(204).send(); // No Content
   } catch (error) {
@@ -142,14 +142,19 @@ wss.on('connection', (ws, req) => {
 });
 
 emitter.on('newEmail', (email) => {
-  const recipient = email.recipient;
-  if (clients.has(recipient)) {
-    const ws = clients.get(recipient);
-    logger.info(`Sending new email notification to`, { recipient });
-    ws.send(JSON.stringify(email));
+  const dbRecipient = email.recipient;  // 比如 "6471" <6471@shenjianl.cn>
+
+  // 遍历所有 clients，用 includes 判断
+  for (const [clientRecipient, ws] of clients.entries()) {
+    if (dbRecipient.includes(clientRecipient)) {
+      logger.info(`Sending new email notification to`, { recipient: clientRecipient });
+      ws.send(JSON.stringify(email));
+      break;  // 如果只想发给第一个匹配的就 break
+    }
   }
 });
 
+
 // Start API server
 server.listen(apiPort, () => {
   logger.info(`Backend API and WebSocket server listening at http://localhost:${apiPort}`);

backend/saveEmail.js

@@ -23,7 +23,7 @@ async function saveEmail(stream) {
 
         const recipient = parsed.to ? parsed.to.text : 'undisclosed-recipients';
         const sender = parsed.from ? parsed.from.text : 'unknown-sender';
-        const subject = parsed.subject;
+        const subject = parsed.subject || 'No Subject';
         const body = parsed.text || (parsed.html || '');
 
         const [result] = await db.execute(