task(E6-frontend): guest panel with ribbon entry and api client

frontend/src/services/api.ts

@@ -764,3 +764,51 @@ export async function aiChat(
   }
   return res.json();
 }
+
+// ─── Guests (Task E6) ──────────────────────────────────
+export interface Guest {
+  id: string;
+  drawing_id: string;
+  name: string;
+  email?: string | null;
+  category: string;
+  seat_element_id?: string | null;
+  notes?: string | null;
+  created_at: string;
+}
+
+export async function listGuests(token: string, drawingId: string): Promise<Guest[]> {
+  const res = await fetch(`${API_BASE}/api/drawings/${drawingId}/guests`, {
+    headers: authHeaders(token),
+  });
+  if (!res.ok) throw new Error(`Failed to list guests: ${res.status}`);
+  return res.json();
+}
+
+export async function createGuest(token: string, drawingId: string, data: { name: string; email?: string; category?: string; notes?: string }): Promise<Guest> {
+  const res = await fetch(`${API_BASE}/api/drawings/${drawingId}/guests`, {
+    method: 'POST',
+    headers: authHeaders(token),
+    body: JSON.stringify(data),
+  });
+  if (!res.ok) throw new Error(`Failed to create guest: ${res.status}`);
+  return res.json();
+}
+
+export async function updateGuest(token: string, id: string, data: Partial<{ name: string; email: string; category: string; seat_element_id: string; notes: string }>): Promise<Guest> {
+  const res = await fetch(`${API_BASE}/api/guests/${id}`, {
+    method: 'PATCH',
+    headers: authHeaders(token),
+    body: JSON.stringify(data),
+  });
+  if (!res.ok) throw new Error(`Failed to update guest: ${res.status}`);
+  return res.json();
+}
+
+export async function deleteGuest(token: string, id: string): Promise<void> {
+  const res = await fetch(`${API_BASE}/api/guests/${id}`, {
+    method: 'DELETE',
+    headers: authHeaders(token),
+  });
+  if (!res.ok) throw new Error(`Failed to delete guest: ${res.status}`);
+}