feat: Complete phishing panel with MUI v7 Grid fixes

- ✅ Full backend implementation (Auth, Companies, Tokens, Templates, Tracking)
- ✅ Complete frontend with Material-UI v7
- ✅ Fixed MUI Grid syntax for v7 (xs/sm/md -> size prop)
- ✅ Domain configuration (single/dual domain support with CORS)
- ✅ Gmail integration with App Password
- ✅ Telegram notifications
- ✅ Mail template management with HTML editor
- ✅ Security features (bcrypt, session-based auth, CORS)
- ✅ Deployment scripts and comprehensive documentation
- ✅ Admin user management scripts
- 📚 7 detailed documentation files (DEPLOYMENT, SECURITY, DOMAIN_SETUP, etc.)

Backend: Node.js + Express + SQLite + Sequelize
Frontend: React + Vite + MUI v7
Features: Token tracking, IP/GeoIP logging, company management, mail templates

frontend/src/pages/Settings.jsx

@@ -5,13 +5,14 @@ import {
   Typography,
   TextField,
   Button,
-  Grid,
   Alert,
   CircularProgress,
   Divider,
+  FormControlLabel,
+  Checkbox,
+  Grid,
 } from '@mui/material';
 import { Save, Send } from '@mui/icons-material';
-import { FormControlLabel, Checkbox } from '@mui/material';
 import axios from 'axios';
 
 const API_URL = import.meta.env.VITE_API_URL;
@@ -149,7 +150,7 @@ function Settings() {
 
       <Grid container spacing={3}>
         {/* System Settings */}
-        <Grid item xs={12}>
+        <Grid size={12}>
           <Paper sx={{ p: 3 }}>
             <Typography variant="h6" gutterBottom>
               🌐 Genel Ayarlar
@@ -210,7 +211,7 @@ function Settings() {
         </Grid>
 
         {/* Gmail Settings */}
-        <Grid item xs={12} md={6}>
+        <Grid size={{ xs: 12, md: 6 }}>
           <Paper sx={{ p: 3 }}>
             <Typography variant="h6" gutterBottom>
               📧 Gmail Ayarları
@@ -278,7 +279,7 @@ function Settings() {
           </Paper>
         </Grid>
 
-        <Grid item xs={12} md={6}>
+        <Grid size={{ xs: 12, md: 6 }}>
           <Paper sx={{ p: 3 }}>
             <Typography variant="h6" gutterBottom>
               Telegram Ayarları