feat: placements update

lib/api/channels.ts

@@ -9,10 +9,32 @@ import type {
   PaginatedResponse,
 } from "@/lib/types/api";
 
+interface CreateChannelInput {
+  username?: string;
+  invite_link?: string;
+}
+
+interface CreateChannelResult {
+  channel: {
+    id: string;
+  };
+}
+
+interface CreateChannelsResponse {
+  results: CreateChannelResult[];
+}
+
 export const channelsApi = {
   /**
    * Get catalog of channels for placements
    */
   list: (params?: ChannelsQueryParams) =>
     api.get<PaginatedResponse<Channel>>("/channels", { params }),
+
+  /**
+   * Create channels by username or invite_link
+   * Returns channel IDs for use in placement creation
+   */
+  create: (channels: CreateChannelInput[]) =>
+    api.post<CreateChannelsResponse>("/channels", { channels }),
 };