feat: implementacion de dashboards por rol, soporte de clases virtuales concurrentes en importador de sheets y cartelera del dia

backend/app/schemas/classroom_dto.py

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+from typing import Optional
+from pydantic import BaseModel, Field, field_validator
+
+class ClassroomBaseDTO(BaseModel):
+    code: str = Field(..., min_length=1, max_length=50, description="Código o nombre del aula (ej: Aula 101, VIRTUAL-A)")
+    floor: str = Field(default="PB", max_length=50, description="Piso o nivel (PB, Piso 1, etc.)")
+    capacity: int = Field(default=30, ge=1, le=10000, description="Capacidad máxima de estudiantes")
+    description: Optional[str] = Field(default=None, max_length=500, description="Detalles o equipamiento")
+    is_active: bool = Field(default=True, description="Estado operativo del aula")
+
+    @field_validator('code')
+    @classmethod
+    def clean_code(cls, v: str) -> str:
+        v = v.strip()
+        if not v:
+            raise ValueError("El código del aula no puede estar vacío.")
+        return v
+
+    @field_validator('floor')
+    @classmethod
+    def clean_floor(cls, v: str) -> str:
+        return str(v).strip() or "PB"
+
+class ClassroomCreateDTO(ClassroomBaseDTO):
+    building_id: Optional[int] = Field(default=None, description="ID del edificio asignado")
+    building_name: Optional[str] = Field(default=None, description="Nombre de edificio (para creación dinámica)")
+
+class ClassroomUpdateDTO(BaseModel):
+    building_id: Optional[int] = None
+    code: Optional[str] = None
+    floor: Optional[str] = None
+    capacity: Optional[int] = None
+    description: Optional[str] = None
+    is_active: Optional[bool] = None
+
+class ClassroomResponseDTO(ClassroomBaseDTO):
+    id: int
+    building_id: Optional[int] = None
+    building_name: str
+    is_virtual: bool
+    location_display: str
+
+    class Config:
+        from_attributes = True