add hotbunny provider + fix domain cookie scoping in requester

New channel: hotbunny (AI-generated hentai, hotbunny.ai JSON API).
Includes thumbnail proxy (/proxy/hotbunny-thumb/) since assets.hotbunny.ai
is CF bot-managed. check.py updated to treat CF-protected format URLs as
warnings rather than errors.

requester.rs: store_response_cookies now honours the Domain attribute in
Set-Cookie headers — cookies scoped to .domain.com are registered against
the parent domain so the wreq Jar returns them for sub.domain.com requests
automatically, without per-provider workarounds.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/proxy.rs

@@ -142,6 +142,11 @@ pub fn config(cfg: &mut web::ServiceConfig) {
         web::resource("/porndish-thumb/{endpoint}*")
             .route(web::post().to(crate::proxies::porndishthumb::get_image))
             .route(web::get().to(crate::proxies::porndishthumb::get_image)),
+    )
+    .service(
+        web::resource("/hotbunny-thumb/{endpoint}*")
+            .route(web::post().to(crate::proxies::hotbunnythumb::get_image))
+            .route(web::get().to(crate::proxies::hotbunnythumb::get_image)),
     );
     cfg.service(
         web::resource("/proxy/pornhub-thumb/{endpoint}*")