ADD：category_id

recommend-server-client/src/main/proto/com/tzld/piaoquan/recommend/server/recommend.proto

@@ -28,6 +28,7 @@ message RecommendRequest {
   string session_id = 17;
   string sub_session_id = 18;
   string page_source = 19;
+  string category_id = 20;
 }
 
 message MachineInfoProto {