Add cumlouder provider

Listing scraper with category/tag/series routing; /search/ is behind a
Cloudflare challenge so keywords map to archives.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MUYdCh2nCVsQYgJAT7gwSi

build.rs

@@ -356,6 +356,11 @@ const PROVIDERS: &[ProviderDef] = &[
         module: "jable",
         ty: "JableProvider",
     },
+    ProviderDef {
+        id: "cumlouder",
+        module: "cumlouder",
+        ty: "CumlouderProvider",
+    },
     ProviderDef {
         id: "fullporner",
         module: "fullporner",