feat: Powiadomienia email o błędach 500

- Dodano send_error_notification() - wysyła email przy błędzie 500
- Szczegóły: URL, ścieżka, user, IP, traceback
- Konfiguracja: ERROR_NOTIFY_EMAIL, SMTP_HOST, SMTP_PORT
- Domyślnie: maciej.pienczyn@inpi.pl

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app.py

@@ -34,6 +34,10 @@ from werkzeug.security import generate_password_hash, check_password_hash
 from dotenv import load_dotenv
 from user_agents import parse as parse_user_agent
 import uuid
+import smtplib
+import traceback as tb_module
+from email.mime.text import MIMEText
+from email.mime.multipart import MIMEMultipart
 
 # Load environment variables (override any existing env vars)
 # Try .env first, then nordabiz_config.txt for production flexibility
@@ -12590,8 +12594,79 @@ def not_found(error):
     return render_template('errors/404.html'), 404
 
 
+def send_error_notification(error, request_info):
+    """Send email notification about 500 errors"""
+    try:
+        smtp_host = os.getenv('SMTP_HOST', 'localhost')
+        smtp_port = int(os.getenv('SMTP_PORT', 25))
+        mail_from = os.getenv('MAIL_FROM', 'noreply@nordabiznes.pl')
+        error_email = os.getenv('ERROR_NOTIFY_EMAIL', 'maciej.pienczyn@inpi.pl')
+
+        if not error_email:
+            return
+
+        # Build error details
+        error_time = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
+        traceback_str = tb_module.format_exc()
+
+        subject = f"🚨 NordaBiz ERROR 500: {request_info.get('path', 'Unknown')}"
+
+        body = f"""
+⚠️ BŁĄD 500 NA NORDABIZNES.PL
+{'='*50}
+
+🕐 Czas: {error_time}
+🌐 URL: {request_info.get('url', 'N/A')}
+📍 Ścieżka: {request_info.get('path', 'N/A')}
+📝 Metoda: {request_info.get('method', 'N/A')}
+👤 Użytkownik: {request_info.get('user', 'Anonimowy')}
+🖥️ IP: {request_info.get('ip', 'N/A')}
+🌍 User-Agent: {request_info.get('user_agent', 'N/A')}
+
+{'='*50}
+📋 BŁĄD:
+{str(error)}
+
+{'='*50}
+📜 TRACEBACK:
+{traceback_str}
+
+{'='*50}
+🔧 Sprawdź logi: ssh maciejpi@10.22.68.249 "sudo journalctl -u nordabiznes --since '10 minutes ago'"
+"""
+
+        msg = MIMEMultipart()
+        msg['From'] = mail_from
+        msg['To'] = error_email
+        msg['Subject'] = subject
+        msg.attach(MIMEText(body, 'plain', 'utf-8'))
+
+        with smtplib.SMTP(smtp_host, smtp_port, timeout=10) as server:
+            server.sendmail(mail_from, [error_email], msg.as_string())
+
+        logger.info(f"Error notification sent to {error_email}")
+    except Exception as e:
+        logger.error(f"Failed to send error notification: {e}")
+
+
 @app.errorhandler(500)
 def internal_error(error):
+    # Collect request info for notification
+    request_info = {
+        'url': request.url if request else 'N/A',
+        'path': request.path if request else 'N/A',
+        'method': request.method if request else 'N/A',
+        'ip': request.remote_addr if request else 'N/A',
+        'user_agent': request.headers.get('User-Agent', 'N/A') if request else 'N/A',
+        'user': current_user.email if current_user and current_user.is_authenticated else 'Anonimowy'
+    }
+
+    # Send notification in background (don't block response)
+    try:
+        send_error_notification(error, request_info)
+    except Exception as e:
+        logger.error(f"Error notification failed: {e}")
+
     return render_template('errors/500.html'), 500