feat(image): add brat + animated brat image generation

Ported from Shirokami-API scraper/image/brat.js (v2 path):
- /image/brat - static brat PNG via brat.siputzx.my.id API
- /image/brat/animated - animated brat GIF
Both return raw image bytes with proper Content-Type (image/png, image/gif)

src/presentation/handler/image.rs

@@ -0,0 +1,41 @@
+//! Axum handlers for image generation endpoints.
+//!
+//! Returns raw image bytes with the proper Content-Type.
+
+use axum::body::Body;
+use axum::extract::Query;
+use axum::http::{header, StatusCode};
+use axum::response::Response;
+use serde::Deserialize;
+
+use crate::application::image as use_cases;
+use crate::presentation::error::AppError;
+
+#[derive(Deserialize)]
+pub struct BratParams {
+    pub text: Option<String>,
+}
+
+pub async fn brat_handler(Query(params): Query<BratParams>) -> Result<Response, AppError> {
+    let text = params
+        .text
+        .ok_or_else(|| AppError::BadRequest("text parameter is required".into()))?;
+    let bytes = use_cases::brat(&text).await?;
+    Ok(Response::builder()
+        .status(StatusCode::OK)
+        .header(header::CONTENT_TYPE, "image/png")
+        .body(Body::from(bytes))
+        .expect("valid response"))
+}
+
+pub async fn brat_animated_handler(Query(params): Query<BratParams>) -> Result<Response, AppError> {
+    let text = params
+        .text
+        .ok_or_else(|| AppError::BadRequest("text parameter is required".into()))?;
+    let bytes = use_cases::brat_animated(&text).await?;
+    Ok(Response::builder()
+        .status(StatusCode::OK)
+        .header(header::CONTENT_TYPE, "image/gif")
+        .body(Body::from(bytes))
+        .expect("valid response"))
+}

src/presentation/handler/mod.rs

@@ -2,6 +2,7 @@ pub mod anime;
 pub mod anime2;
 pub mod downloader;
 pub mod health;
+pub mod image;
 pub mod komik;
 pub mod misc;
 pub mod proxy;

src/presentation/router.rs

@@ -349,6 +349,15 @@ pub fn build_router(app_state: Arc<AppState>) -> anyhow::Result<Router> {
             "/tool/cek-resi",
             axum::routing::get(crate::presentation::handler::tools::cek_resi_handler),
         )
+        // Image routes
+        .route(
+            "/image/brat",
+            axum::routing::get(crate::presentation::handler::image::brat_handler),
+        )
+        .route(
+            "/image/brat/animated",
+            axum::routing::get(crate::presentation::handler::image::brat_animated_handler),
+        )
         // Health
         .route(
             "/health",