refactor: Refactor the service of retrieval the recommend app (#9302)

api/services/recommend_app/recommend_app_base.py

@@ -0,0 +1,17 @@
+from abc import ABC, abstractmethod
+
+
+class RecommendAppRetrievalBase(ABC):
+    """Interface for recommend app retrieval."""
+
+    @abstractmethod
+    def get_recommended_apps_and_categories(self, language: str) -> dict:
+        raise NotImplementedError
+
+    @abstractmethod
+    def get_recommend_app_detail(self, app_id: str):
+        raise NotImplementedError
+
+    @abstractmethod
+    def get_type(self) -> str:
+        raise NotImplementedError