feat(weebs): add anime/manga info, whatanime, waifu endpoints

Ported from Shirokami-API scraper/weebs/*.js:
- /weebs/anime-info (jikan.moe anime search)
- /weebs/manga-info (jikan.moe manga search)
- /weebs/whatanime (trace.moe reverse image search)
- /weebs/sfw-waifu + /weebs/nsfw-waifu (waifu.pics)

Tested: anime-info (Naruto real data) + whatanime (real match). manga-info
+ waifu currently report upstream 504/DNS-down (jikan manga endpoint &
waifu.pics unreachable from VPS right now) - proxy logic verified via the
working anime/whatanime siblings.

src/presentation/handler/mod.rs

@@ -6,3 +6,4 @@ pub mod komik;
 pub mod misc;
 pub mod proxy;
 pub mod stalk;
+pub mod weebs;

src/presentation/handler/weebs.rs

@@ -0,0 +1,65 @@
+//! Axum handlers for weebs endpoints.
+//!
+//! Ported from Shirokami-API `scraper/weebs/*.js`.
+
+use axum::extract::Query;
+use axum::http::StatusCode;
+use axum::Json;
+use serde::Deserialize;
+use serde_json::Value;
+
+use crate::application::weebs as use_cases;
+use crate::presentation::error::AppError;
+
+#[derive(Deserialize)]
+pub struct WeebsParams {
+    pub query: Option<String>,
+    pub q: Option<String>,
+    pub url: Option<String>,
+    pub tag: Option<String>,
+}
+
+fn require<'a>(v: Option<&'a String>, name: &str) -> Result<String, AppError> {
+    v.cloned()
+        .ok_or_else(|| AppError::BadRequest(format!("Missing '{}' parameter", name)))
+}
+
+/// GET /weebs/anime-info?query=naruto
+pub async fn anime_info_handler(
+    Query(p): Query<WeebsParams>,
+) -> Result<(StatusCode, Json<Value>), AppError> {
+    let query = require(p.query.as_ref().or(p.q.as_ref()), "query")?;
+    Ok((StatusCode::OK, Json(use_cases::anime_info(&query).await?)))
+}
+
+/// GET /weebs/manga-info?query=one%20piece
+pub async fn manga_info_handler(
+    Query(p): Query<WeebsParams>,
+) -> Result<(StatusCode, Json<Value>), AppError> {
+    let query = require(p.query.as_ref().or(p.q.as_ref()), "query")?;
+    Ok((StatusCode::OK, Json(use_cases::manga_info(&query).await?)))
+}
+
+/// GET /weebs/whatanime?url=<image-url>
+pub async fn whatanime_handler(
+    Query(p): Query<WeebsParams>,
+) -> Result<(StatusCode, Json<Value>), AppError> {
+    let url = require(p.url.as_ref(), "url")?;
+    Ok((StatusCode::OK, Json(use_cases::whatanime(&url).await?)))
+}
+
+/// GET /weebs/sfw-waifu?tag=waifu
+pub async fn sfw_waifu_handler(
+    Query(p): Query<WeebsParams>,
+) -> Result<(StatusCode, Json<Value>), AppError> {
+    let tag = require(p.tag.as_ref(), "tag")?;
+    Ok((StatusCode::OK, Json(use_cases::sfw_waifu(&tag).await?)))
+}
+
+/// GET /weebs/nsfw-waifu?tag=waifu
+pub async fn nsfw_waifu_handler(
+    Query(p): Query<WeebsParams>,
+) -> Result<(StatusCode, Json<Value>), AppError> {
+    let tag = require(p.tag.as_ref(), "tag")?;
+    Ok((StatusCode::OK, Json(use_cases::nsfw_waifu(&tag).await?)))
+}

src/presentation/router.rs

@@ -282,6 +282,27 @@ pub fn build_router(app_state: Arc<AppState>) -> anyhow::Result<Router> {
             "/stalk/youtube",
             axum::routing::get(crate::presentation::handler::stalk::youtube_handler),
         )
+        // Weebs routes
+        .route(
+            "/weebs/anime-info",
+            axum::routing::get(crate::presentation::handler::weebs::anime_info_handler),
+        )
+        .route(
+            "/weebs/manga-info",
+            axum::routing::get(crate::presentation::handler::weebs::manga_info_handler),
+        )
+        .route(
+            "/weebs/whatanime",
+            axum::routing::get(crate::presentation::handler::weebs::whatanime_handler),
+        )
+        .route(
+            "/weebs/sfw-waifu",
+            axum::routing::get(crate::presentation::handler::weebs::sfw_waifu_handler),
+        )
+        .route(
+            "/weebs/nsfw-waifu",
+            axum::routing::get(crate::presentation::handler::weebs::nsfw_waifu_handler),
+        )
         // Health
         .route(
             "/health",