feat: implementar ABM completo de comisiones, carreras y asignaturas con proteccion de integridad y corregir edificios y campus virtual

backend/app/models/building.py

@@ -17,10 +17,40 @@ class Building(db.Model):
     # Relationships
     classrooms = db.relationship('Classroom', backref='building_entity', lazy=True, foreign_keys='Classroom.building_id')
     
+    @property
+    def is_virtual(self):
+        """Identifica si la sede corresponde al Campus Virtual"""
+        c = (self.code or '').upper()
+        n = (self.name or '').upper()
+        return 'VIRTUAL' in c or 'VIRTUAL' in n
+
+    @property
+    def physical_capacity(self):
+        """Capacidad física instalada real (excluye aulas virtuales con capacidad 9999 o infinitas)"""
+        if self.is_virtual:
+            return 0
+        return sum(c.capacity for c in self.classrooms if c.is_active and (c.capacity or 0) < 999 and not getattr(c, 'is_virtual', False))
+
     @property
     def total_capacity(self):
-        """Total student capacity across active classrooms in this building"""
-        return sum(c.capacity for c in self.classrooms if c.is_active)
+        """Capacidad para compatibilidad histórica"""
+        if self.is_virtual:
+            return 0
+        return self.physical_capacity
+
+    @property
+    def capacity_display(self):
+        """Representación textual clara para UI/UX"""
+        if self.is_virtual:
+            return "Ilimitada (Virtual)"
+        return str(self.physical_capacity)
+
+    @property
+    def floors_display(self):
+        """Representación de pisos"""
+        if self.is_virtual:
+            return "Digital"
+        return str(self.floors)
         
     @property
     def classrooms_count(self):
@@ -34,10 +64,14 @@ class Building(db.Model):
             'code': self.code,
             'address': self.address,
             'floors': self.floors,
+            'floors_display': self.floors_display,
             'description': self.description,
             'is_active': self.is_active,
+            'is_virtual': self.is_virtual,
             'classrooms_count': self.classrooms_count,
-            'total_capacity': self.total_capacity,
+            'physical_capacity': self.physical_capacity,
+            'total_capacity': self.physical_capacity if not self.is_virtual else 0,
+            'capacity_display': self.capacity_display,
             'created_at': self.created_at.isoformat() if self.created_at else None
         }