feat(client): add mci-server event poster

channel-service/app/clients/mci_server_client.py

@@ -0,0 +1,19 @@
+from __future__ import annotations
+
+import httpx
+
+from app.models.event import OutboundEvent
+
+
+class MciServerClient:
+    def __init__(self, base_url: str, timeout: float = 10.0):
+        self.base_url = base_url.rstrip("/")
+        self.timeout = timeout
+
+    async def post_event(self, event: OutboundEvent) -> None:
+        async with httpx.AsyncClient(timeout=self.timeout) as client:
+            response = await client.post(
+                f"{self.base_url}/api/v1/channel-account/event",
+                json=event.to_payload(),
+            )
+            response.raise_for_status()