feat(dns): add db-backed DNS provider, domain, and record management with ops UI support

ts/db/documents/classes.domain.doc.ts

@@ -0,0 +1,66 @@
+import * as plugins from '../../plugins.js';
+import { DcRouterDb } from '../classes.dcrouter-db.js';
+import type { TDomainSource } from '../../../ts_interfaces/data/domain.js';
+
+const getDb = () => DcRouterDb.getInstance().getDb();
+
+@plugins.smartdata.Collection(() => getDb())
+export class DomainDoc extends plugins.smartdata.SmartDataDbDoc<DomainDoc, DomainDoc> {
+  @plugins.smartdata.unI()
+  @plugins.smartdata.svDb()
+  public id!: string;
+
+  /** FQDN — kept lowercased on save. */
+  @plugins.smartdata.svDb()
+  public name: string = '';
+
+  @plugins.smartdata.svDb()
+  public source!: TDomainSource;
+
+  @plugins.smartdata.svDb()
+  public providerId?: string;
+
+  @plugins.smartdata.svDb()
+  public authoritative: boolean = false;
+
+  @plugins.smartdata.svDb()
+  public nameservers?: string[];
+
+  @plugins.smartdata.svDb()
+  public externalZoneId?: string;
+
+  @plugins.smartdata.svDb()
+  public lastSyncedAt?: number;
+
+  @plugins.smartdata.svDb()
+  public description?: string;
+
+  @plugins.smartdata.svDb()
+  public createdAt!: number;
+
+  @plugins.smartdata.svDb()
+  public updatedAt!: number;
+
+  @plugins.smartdata.svDb()
+  public createdBy!: string;
+
+  constructor() {
+    super();
+  }
+
+  public static async findById(id: string): Promise<DomainDoc | null> {
+    return await DomainDoc.getInstance({ id });
+  }
+
+  public static async findByName(name: string): Promise<DomainDoc | null> {
+    return await DomainDoc.getInstance({ name: name.toLowerCase() });
+  }
+
+  public static async findAll(): Promise<DomainDoc[]> {
+    return await DomainDoc.getInstances({});
+  }
+
+  public static async findByProviderId(providerId: string): Promise<DomainDoc[]> {
+    return await DomainDoc.getInstances({ providerId });
+  }
+}