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

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

@@ -267,11 +267,7 @@ impl ProviderManager {
 
     /// Try to handle a SIP response as a provider registration response.
     /// Returns true if consumed.
-    pub async fn handle_response(
-        &self,
-        msg: &SipMessage,
-        socket: &UdpSocket,
-    ) -> bool {
+    pub async fn handle_response(&self, msg: &SipMessage, socket: &UdpSocket) -> bool {
         for ps_arc in &self.providers {
             let mut ps = ps_arc.lock().await;
             let was_registered = ps.is_registered;
@@ -322,7 +318,10 @@ impl ProviderManager {
     }
 
     /// Find a provider by its config ID (e.g. "easybell").
-    pub async fn find_by_provider_id(&self, provider_id: &str) -> Option<Arc<Mutex<ProviderState>>> {
+    pub async fn find_by_provider_id(
+        &self,
+        provider_id: &str,
+    ) -> Option<Arc<Mutex<ProviderState>>> {
         for ps_arc in &self.providers {
             let ps = ps_arc.lock().await;
             if ps.config.id == provider_id {