Implement rate limiting with 41 responses and comprehensive logging

- Add concurrent connection handling with tokio::spawn for proper rate limiting
- Send '41 Server unavailable' responses instead of dropping connections
- Move request logger initialization earlier to enable rate limiting logs
- Add logging for rate limited requests: 'Concurrent request limit exceeded'
- Fix clippy warnings: needless borrows and match simplification
- Update test script analysis to expect 41 responses for rate limiting

src/logging.rs

@@ -28,13 +28,10 @@ impl RequestLogger {
 }
 
 fn extract_client_ip(stream: &TlsStream<TcpStream>) -> String {
-    match stream.get_ref() {
-        (tcp_stream, _) => {
-            match tcp_stream.peer_addr() {
-                Ok(addr) => addr.to_string(),
-                Err(_) => "unknown".to_string(),
-            }
-        }
+    let (tcp_stream, _) = stream.get_ref();
+    match tcp_stream.peer_addr() {
+        Ok(addr) => addr.to_string(),
+        Err(_) => "unknown".to_string(),
     }
 }