Fix tube8 ids and Referer-gated Aylo thumbnails

Sponsored channel cards carry a stale data-video-id that 404s; use the
card link target. The signed pix-cdn77 thumbnail hosts 403 without a
Referer, so route them (tube8, ph-shorties) through a new host-restricted
aylo-thumb proxy. Also correct the pornhub-thumb route that sat under a
doubled /proxy prefix.

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

src/providers/coomer.rs

@@ -489,15 +489,6 @@ impl CoomerProvider {
     }
 }
 
-fn target_label(target: &Target) -> &'static str {
-    match target {
-        Target::Latest => "latest",
-        Target::Popular => "popular",
-        Target::Search { .. } => "search",
-        Target::Uploader { .. } => "uploader",
-    }
-}
-
 fn percent_encode(value: &str) -> String {
     let mut out = String::with_capacity(value.len());
     for byte in value.as_bytes() {