fix: rename request-human route to handoff for Iris MVC compatibility

PostHandoff maps to POST /handoff correctly in Iris MVC auto-routing.

internal/controllers/dashboard/conversation_controller.go

@@ -185,7 +185,7 @@ func (c *ConversationController) PostTransfer() *web.JsonResult {
 	return web.JsonSuccess()
 }
 
-func (c *ConversationController) PostRequest_human() *web.JsonResult {
+func (c *ConversationController) PostHandoff() *web.JsonResult {
 	operator, err := services.AuthService.RequirePermission(c.Ctx, constants.PermissionConversationAssign)
 	if err != nil {
 		return web.JsonError(err)

web/lib/api/admin.ts

@@ -834,7 +834,7 @@ export function assignConversation(
 }
 
 export function requestHumanConversation(conversationId: number) {
-  return request<void>("/api/dashboard/conversation/request-human", {
+  return request<void>("/api/dashboard/conversation/handoff", {
     method: "POST",
     body: JSON.stringify({ conversationId }),
   })