feat: Qwen3-VL reranker client

tests/rerank_tests.rs

@@ -0,0 +1,24 @@
+use alpha_id::rerank::rerank;
+use alpha_id::ionos::IonosClient;
+use std::io::Write;
+
+#[test]
+fn rerank_returns_scores_aligned_to_documents() {
+    let server = tiny_http::Server::http("127.0.0.1:0").unwrap();
+    let url = format!("http://{}", server.server_addr());
+    let h = std::thread::spawn(move || {
+        if let Ok(req) = server.recv() {
+            let body = r#"{"results":[{"index":0,"relevance_score":0.2},
+                                       {"index":1,"relevance_score":0.9}]}"#;
+            req.respond(tiny_http::Response::from_string(body)).ok();
+        }
+    });
+    let mut tf = tempfile::NamedTempFile::new().unwrap();
+    write!(tf, "tok").unwrap();
+    let c = IonosClient::new(&url, tf.path().to_str().unwrap()).unwrap();
+    let scores = rerank(&c, "Qwen/Qwen3-VL-Reranker-8B", "diabetes",
+                        &["herzinfarkt".to_string(), "diabetes typ 2".to_string()]).unwrap();
+    assert_eq!(scores.len(), 2);
+    assert!(scores[1] > scores[0]);
+    h.join().ok();
+}