Update server with new guest rsvp endpoint

backend/app/schemas/guests.py

@@ -6,6 +6,9 @@ from typing import Optional, Any, Dict
 from app.models.guest import GuestStatus
 from uuid import UUID
 
+from app.schemas.rsvp import RSVPSchema, RSVPStatus
+
+
 class GuestBase(BaseModel):
     event_id: UUID
     invited_by: UUID
@@ -46,4 +49,25 @@ class GuestRead(GuestBase):
     actual_additional_guests: int
     is_blocked: bool
     model_config = ConfigDict(from_attributes=True)
-    invitation_code: str
+    invitation_code: str
+
+class GuestWithRSVPResponse(BaseModel):
+    """
+    Combined response model that includes both guest and RSVP information.
+    This gives the frontend a complete picture of the guest's response in a single object.
+    """
+    guest: GuestRead
+    rsvp: Optional[RSVPSchema] = None
+
+    class Config:
+        from_attributes = True
+
+def map_rsvp_status_to_guest_status(rsvp_status: RSVPStatus) -> GuestStatus:
+    if rsvp_status == RSVPStatus.ATTENDING:
+        return GuestStatus.CONFIRMED
+    elif rsvp_status == RSVPStatus.NOT_ATTENDING:
+        return GuestStatus.DECLINED
+    elif rsvp_status == RSVPStatus.MAYBE:
+        return GuestStatus.PENDING
+    else:
+        return GuestStatus.INVITED