feat: Implement consolidated catalog services and endpoints for pedimento and invoice creation/edition.

backend/api/v1/modules/a76/classes/dto.py

@@ -196,4 +196,33 @@ class ClassSearchDTO(BaseModel):
     )
 
     class Config:
-        from_attributes = True
+        from_attributes = True
+
+
+class ClassWithFADataResponse(BaseModel):
+    """DTO para respuesta de clase con datos FA embebidos (para fixed-asset-classes)"""
+    
+    # Base class fields
+    id: int
+    tenant_id: int
+    company_id: int
+    class_code: str
+    description_es: Optional[str] = None
+    description_en: Optional[str] = None
+    material_key: Optional[str] = None
+    unit_of_measure: Optional[str] = None
+    fraction: Optional[str] = None
+    us_fraction: Optional[str] = None
+    sub_key: Optional[str] = None
+    physical_review: Optional[int] = None
+    iva_exempt_fraction: Optional[str] = None
+    created_at: datetime
+    updated_at: datetime
+    
+    # FA-specific fields (embedded from a24.fa_classes)
+    fa_class_id: Optional[int] = None
+    depreciation_rate: Optional[Decimal] = None
+    fda_code: Optional[str] = None
+    class_enabled: Optional[bool] = None
+    
+    model_config = ConfigDict(from_attributes=True)