feat(fase3): add conversation transfer and note API routes

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

services/api-gateway/app/schemas/whatsapp.py

@@ -74,3 +74,20 @@ class InternalEventRequest(BaseModel):
     type: str
     accountId: str
     data: dict
+
+
+class TransferToQueueRequest(BaseModel):
+    queue_id: UUID
+
+
+class TransferToAgentRequest(BaseModel):
+    agent_id: UUID
+
+
+class ResolveConversationRequest(BaseModel):
+    csat_score: Optional[int] = None
+    csat_feedback: Optional[str] = None
+
+
+class InternalNoteRequest(BaseModel):
+    content: str