refactor(api/core/app/apps/base_app_generator.py): improve input validation and sanitization in BaseAppGenerator (#5866)

api/core/app/app_config/entities.py

@@ -114,6 +114,10 @@ class VariableEntity(BaseModel):
     default: Optional[str] = None
     hint: Optional[str] = None
 
+    @property
+    def name(self) -> str:
+        return self.variable
+
 
 class ExternalDataVariableEntity(BaseModel):
     """