feat: add ticket list visual support api

backend/apps/tickets/schemas.py

@@ -28,6 +28,12 @@ class TicketStatusIn(Schema):
     remark: str = ""
 
 
+class TicketUserOut(Schema):
+    id: int
+    username: str
+    display_name: str
+
+
 class TicketOut(Schema):
     id: int
     ticket_no: str
@@ -38,11 +44,22 @@ class TicketOut(Schema):
     impact_scope: str
     environment: str
     related_system: str
+    requester_id: int | None
     assignee_id: int | None
+    requester: TicketUserOut | None = None
+    assignee: TicketUserOut | None = None
     created_at: datetime
     updated_at: datetime
 
 
+class TicketListOut(Schema):
+    items: list[TicketOut]
+    page: int
+    page_size: int
+    total: int
+    total_pages: int
+
+
 class TicketEventOut(Schema):
     id: int
     event_type: str