refactor(pixiv): keep the artwork type as the API's string

TypeModel's Illust and Manga variants existed only so serde would accept
those values -- both call sites ask a single question (is this ugoira?), so
the field is a String and the check is a comparison. Same for a type the API
adds later: it no longer fails the whole parse.

crates/x-media/src/site/pixiv/api.rs

@@ -4,7 +4,7 @@
 //! `app-api.pixiv.net`, deserialized with the kept `model.rs` types.
 
 use super::interface::Illustration;
-use super::model::{IllustrationModel, TypeModel, UgoiraMetadataModel};
+use super::model::{IllustrationModel, UgoiraMetadataModel};
 use crate::media::Media;
 use crate::site::FetchError;
 use std::env;
@@ -139,7 +139,7 @@ impl PixivAPI {
     pub async fn fetch(&self, illust_id: u64) -> Result<Illustration, FetchError> {
         let model = self.illust_detail(illust_id).await?;
         let mut illustration = Illustration::from_model(&model);
-        if matches!(&model.r#type, TypeModel::Ugoira) {
+        if model.r#type == "ugoira" {
             // Real ugoira support: download the frame zip and encode an MP4.
             // Without ffmpeg the post stays unsupported (empty media, like
             // Python) — but a *failed* download/encode is reported instead:

crates/x-media/src/site/pixiv/interface.rs

@@ -1,4 +1,4 @@
-use super::model::{IllustrationModel, TypeModel};
+use super::model::IllustrationModel;
 use crate::media::Media;
 use crate::site::{FetchError, Fetched, PixivError, Site, SiteFuture};
 use html_escape::{encode_double_quoted_attribute, encode_text};
@@ -225,7 +225,7 @@ impl Illustration {
             tags.insert(0, "AI".to_string());
         }
         let mut media = vec![];
-        if matches!(&model.r#type, TypeModel::Ugoira) {
+        if model.r#type == "ugoira" {
             // No static images for ugoira; the fetch path encodes an MP4 via
             // ffmpeg and appends it as a Video item (api.rs). This fallback
             // keeps media empty when encoding fails or ffmpeg is missing.

crates/x-media/src/site/pixiv/model.rs

@@ -10,7 +10,10 @@ pub struct IllustrationModel {
     /// works (`<br />`, `<a href>`, sometimes `<p>`), empty for many.
     #[serde(default)]
     pub caption: String,
-    pub r#type: TypeModel,
+    /// `"illust"` / `"manga"` / `"ugoira"`; only ugoira changes how the
+    /// artwork is fetched (a zip of frames to encode), so the rest is kept as
+    /// the string the API sent rather than as variants nothing matches.
+    pub r#type: String,
     pub image_urls: ImageUrlsModel,
     pub user: UserInfoModel,
     pub tags: Vec<IllustrationTagModel>,
@@ -22,16 +25,6 @@ pub struct IllustrationModel {
     pub meta_pages: Vec<MetaPageModel>,
 }
 
-#[derive(Deserialize, Debug)]
-pub enum TypeModel {
-    #[serde(rename = "illust")]
-    Illust,
-    #[serde(rename = "manga")]
-    Manga,
-    #[serde(rename = "ugoira")]
-    Ugoira,
-}
-
 #[derive(Deserialize, Debug)]
 pub struct UserInfoModel {
     pub id: u64,