fix: resolve clippy warnings (matches!, map_or, redundant guard, unnecessary allocations)

src/mitm/proxy.rs

@@ -46,6 +46,7 @@ const PASSTHROUGH_DOMAINS: &[&str] = &[
 ];
 
 /// Configuration for the MITM proxy.
+#[derive(Default)]
 pub struct MitmConfig {
     /// Port to listen on (0 = auto-assign).
     pub port: u16,
@@ -53,14 +54,6 @@ pub struct MitmConfig {
     pub modify_requests: bool,
 }
 
-impl Default for MitmConfig {
-    fn default() -> Self {
-        Self {
-            port: 0,
-            modify_requests: false,
-        }
-    }
-}
 
 /// Run the MITM proxy server.
 ///
@@ -405,7 +398,7 @@ async fn handle_http_over_tls(
     async fn resolve_upstream(domain: &str) -> String {
         // 1. Try dig @8.8.8.8 (bypasses /etc/hosts)
         if let Ok(output) = tokio::process::Command::new("dig")
-            .args(["+short", &format!("@8.8.8.8"), domain])
+            .args(["+short", "@8.8.8.8", domain])
             .output()
             .await
         {