fix: convert QR to base64 DataURL and migrate old session to Slot 1 dynamically

whatsapp_bridge/server.js

@@ -278,11 +278,19 @@ function bootstrapSlot(slotId) {
   // ─── Listeners ───────────────────────────────────────────────────────────
   client.on('qr', (qr) => {
     console.log(`[WA] QR generated for Slot ${slotId}`);
-    slotState.qrCodeCache = qr;
+    
+    const QRCode = require('qrcode');
+    QRCode.toDataURL(qr, (err, url) => {
+      if (err) {
+        console.error(`[WA] Failed to generate QR DataURL for Slot ${slotId}:`, err.message);
+        return;
+      }
+      slotState.qrCodeCache = url;
       slotState.clientReady = false;
       
       updateSlotStatus(slotId, 'qrcode');
-    broadcast(slotId, { type: 'qr', qr });
+      broadcast(slotId, { type: 'qr', qr: url });
+    });
   });
 
   client.on('authenticated', () => {
@@ -719,6 +727,24 @@ server.listen(PORT, async () => {
     // Initialize MySQL Database
     await initDatabase();
 
+    // Session Migration Logic: Move old session to slot-1 if slot-1 is empty
+    const oldSessionPath = path.join(__dirname, '.wwebjs_auth', 'session');
+    const slot1SessionPath = path.join(__dirname, '.wwebjs_auth', 'session-slot-1');
+    if (fs.existsSync(oldSessionPath) && !fs.existsSync(slot1SessionPath)) {
+      console.log('[MIGRATION] Migrating active WhatsApp session from old version to Slot 1...');
+      try {
+        if (fs.cpSync) {
+          fs.cpSync(oldSessionPath, slot1SessionPath, { recursive: true });
+        } else {
+          const { execSync } = require('child_process');
+          execSync(`cp -R "${oldSessionPath}" "${slot1SessionPath}"`);
+        }
+        console.log('[MIGRATION] Session migrated successfully! Slot 1 will load connected.');
+      } catch (migrationErr) {
+        console.error('[MIGRATION ERROR] Failed to migrate session:', migrationErr.message);
+      }
+    }
+
     // Auto-bootstrap Slot 1 at startup
     bootstrapSlot(1);