refactor: add Ext postfix for APIExt types

sdgb-api/src/title/methods/api_ext/mod.rs

@@ -4,9 +4,9 @@ use crate::title::methods::{APIExt, APIMethod};
 fn api_implement(api_names: Vec<String>) {
     for api_name in api_names {
         crabtime::output!(
-            pub struct {{api_name}};
+            pub struct {{api_name}}Ext;
 
-            impl APIExt for {{api_name}} {
+            impl APIExt for {{api_name}}Ext {
                 const METHOD: APIMethod = APIMethod::{{api_name}};
                 type Payload = crate::title::model::{{api_name}};
                 type Response  = crate::title::model::{{api_name}}Resp;