unifi: list networks and set the DNS their DHCP hands out

Which DNS server the home network's DHCP hands out could be changed only
in the controller's own interface or by hand against its API (novox/hq
issue 198).

modules/unifi/client.ts

@@ -23,6 +23,19 @@ export interface UnifiPortForward {
   site_id?: string;
 }
 
+export interface UnifiNetwork {
+  _id: string;
+  name: string;
+  purpose: string;
+  ip_subnet?: string;
+  dhcpd_enabled?: boolean;
+  dhcpd_dns_enabled?: boolean;
+  dhcpd_dns_1?: string;
+  dhcpd_dns_2?: string;
+  dhcpd_dns_3?: string;
+  dhcpd_dns_4?: string;
+}
+
 export interface UnifiDevice {
   _id: string;
   name: string;
@@ -232,6 +245,17 @@ export class UnifiApiClient {
     await this.request<unknown>("DELETE", `/api/s/${this.site}/rest/portforward/${id}`);
   }
 
+  // --- Networks ---
+
+  async listNetworks(): Promise<UnifiNetwork[]> {
+    return this.request<UnifiNetwork>("GET", `/api/s/${this.site}/rest/networkconf`);
+  }
+
+  async updateNetwork(id: string, fields: Partial<UnifiNetwork>): Promise<UnifiNetwork> {
+    const result = await this.request<UnifiNetwork>("PUT", `/api/s/${this.site}/rest/networkconf/${id}`, fields);
+    return result[0];
+  }
+
   // --- Devices ---
 
   async listDevices(): Promise<UnifiDevice[]> {