fix(GRO-982): address 5 test failures in inbound webhook

- Fix signature route tests: use /messaging not full mount path
- Fix handleMessageReceived mock order: business lookup first
- Fix stale mock state: add full mockReset in handleMessageFinalized beforeEach
- Fix delivery logic: set delivered for all message.finalized events
- Deduplicate test that was accidentally added twice

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/services/messaging/inbound.ts

@@ -175,10 +175,7 @@ export async function handleMessageFinalized(payload: TelnyxMessageReceivedPaylo
 
   let newStatus = existing.status;
   if (payload.data.event_type === "message.finalized") {
-    const deliveryReceipt = message as { direction?: string; to?: Array<{ phone: string }> };
-    if (deliveryReceipt.direction === "inbound") {
-      newStatus = "delivered";
-    }
+    newStatus = "delivered";
   }
 
   if (newStatus !== existing.status) {