Add fullporner provider with xiaoshenke proxy

- Implement fullporner.com provider with search, pagination, categories, pornstars
- Add xiaoshenke.net proxy for Cloudflare-protected embed videos
- Proxy fetches signed URLs via FlareSolverr and streams video content
- Fix quality bitmask mapping (1=360p, 2=480p, 4=720p, 8=1080p)
- Support HEAD/GET/Range for video streaming

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

src/proxy.rs

@@ -189,6 +189,12 @@ pub fn config(cfg: &mut web::ServiceConfig) {
             .route(web::post().to(crate::proxies::melonstube::serve))
             .route(web::get().to(crate::proxies::melonstube::serve)),
     );
+    cfg.service(
+        web::resource("/xiaoshenke/{endpoint}*")
+            .route(web::post().to(crate::proxies::xiaoshenke::serve_media))
+            .route(web::get().to(crate::proxies::xiaoshenke::serve_media))
+            .route(web::head().to(crate::proxies::xiaoshenke::serve_media)),
+    );
 }
 
 async fn proxy2redirect(