feat(calendar): add EventGuest model and total_attendee_count property

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

database.py

@@ -2205,11 +2205,17 @@ class NordaEvent(Base):
     speaker_company = relationship('Company')
     creator = relationship('User', foreign_keys=[created_by])
     attendees = relationship('EventAttendee', back_populates='event', cascade='all, delete-orphan')
+    guests = relationship('EventGuest', back_populates='event', cascade='all, delete-orphan')
 
     @property
     def attendee_count(self):
         return len(self.attendees)
 
+    @property
+    def total_attendee_count(self):
+        """Łączna liczba uczestników + gości (do sprawdzania limitu max_attendees)."""
+        return len(self.attendees) + len(self.guests)
+
     @property
     def is_past(self):
         from datetime import date
@@ -2304,6 +2310,32 @@ class EventAttendee(Base):
     user = relationship('User')
 
 
+class EventGuest(Base):
+    """Osoby towarzyszące na wydarzeniach (bez konta na portalu)"""
+    __tablename__ = 'event_guests'
+
+    id = Column(Integer, primary_key=True)
+    event_id = Column(Integer, ForeignKey('norda_events.id', ondelete='CASCADE'), nullable=False, index=True)
+    host_user_id = Column(Integer, ForeignKey('users.id', ondelete='CASCADE'), nullable=False, index=True)
+    first_name = Column(String(100))
+    last_name = Column(String(100))
+    organization = Column(String(255))
+    created_at = Column(DateTime, default=datetime.now, nullable=False)
+
+    event = relationship('NordaEvent', back_populates='guests')
+    host = relationship('User')
+
+    @property
+    def display_name(self):
+        """Nazwa wyświetlana gościa — łączy dostępne pola."""
+        parts = []
+        if self.first_name:
+            parts.append(self.first_name)
+        if self.last_name:
+            parts.append(self.last_name)
+        return ' '.join(parts) if parts else '(brak danych)'
+
+
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 # PRIVATE MESSAGES
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