feat: Enhance fixed asset class management with new fields, refactor forms, and update invoice-related services.

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

@@ -223,6 +223,7 @@ class ClassWithFADataResponse(BaseModel):
     fa_class_id: Optional[int] = None
     depreciation_rate: Optional[Decimal] = None
     fda_code: Optional[str] = None
+    eccn_code: Optional[str] = None
     class_enabled: Optional[bool] = None
     
     model_config = ConfigDict(from_attributes=True)

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

@@ -152,6 +152,7 @@ class ClassService:
                 "fa_class_id": fa_class.id if fa_class else None,
                 "depreciation_rate": fa_class.depreciation_rate if fa_class else None,
                 "fda_code": fa_class.fda_code if fa_class else None,
+                "eccn_code": fa_class.eccn_code if fa_class else None,
                 "class_enabled": fa_class.class_enabled if fa_class else None,
             }
             combined.append(class_dict)