refactor: implement fetchall with generic type

sdgb-api/src/title/model/get_user_preview_api/mod.rs

@@ -9,6 +9,12 @@ pub struct GetUserPreviewApi {
     pub user_id: u32,
 }
 
+impl From<u32> for GetUserPreviewApi {
+    fn from(user_id: u32) -> Self {
+        Self { user_id }
+    }
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize, Encode, Decode)]
 #[serde(rename_all = "camelCase")]
 pub struct GetUserPreviewApiResp {