feat(routing): require explicit inbound DID routes and normalize SIP identities for provider-based number matching

rust/crates/proxy-engine/src/sip_transport.rs

@@ -28,10 +28,8 @@ impl SipTransport {
     }
 
     /// Spawn the UDP receive loop. Calls the handler for every received packet.
-    pub fn spawn_receiver<F>(
-        &self,
-        handler: F,
-    ) where
+    pub fn spawn_receiver<F>(&self, handler: F)
+    where
         F: Fn(&[u8], SocketAddr) + Send + 'static,
     {
         let socket = self.socket.clone();