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

ts/dns/providers/interfaces.ts

@@ -0,0 +1,67 @@
+import type { TDnsRecordType } from '../../../ts_interfaces/data/dns-record.js';
+import type { IProviderDomainListing } from '../../../ts_interfaces/data/dns-provider.js';
+
+/**
+ * A DNS record as seen at a provider's API. The `providerRecordId` field
+ * is the provider's internal identifier, used for subsequent updates and
+ * deletes (since providers can have multiple records of the same name+type).
+ */
+export interface IProviderRecord {
+  providerRecordId: string;
+  name: string;
+  type: TDnsRecordType;
+  value: string;
+  ttl: number;
+  proxied?: boolean;
+}
+
+/**
+ * Input shape for creating / updating a DNS record at a provider.
+ */
+export interface IProviderRecordInput {
+  name: string;
+  type: TDnsRecordType;
+  value: string;
+  ttl?: number;
+  proxied?: boolean;
+}
+
+/**
+ * Outcome of a connection test against a provider's API.
+ */
+export interface IConnectionTestResult {
+  ok: boolean;
+  error?: string;
+}
+
+/**
+ * Pluggable DNS provider client interface. One implementation per provider type
+ * (Cloudflare, Route53, …). Implementations live in ts/dns/providers/ and are
+ * instantiated by `createDnsProvider()` in factory.ts.
+ *
+ * NOT a smartdata interface — this is the *runtime* client. The persisted
+ * representation is in `IDnsProvider` (ts_interfaces/data/dns-provider.ts).
+ */
+export interface IDnsProviderClient {
+  /** Lightweight check that credentials are valid and the API is reachable. */
+  testConnection(): Promise<IConnectionTestResult>;
+
+  /** List all DNS zones visible to this provider account. */
+  listDomains(): Promise<IProviderDomainListing[]>;
+
+  /** List all DNS records for a zone (FQDN). */
+  listRecords(domain: string): Promise<IProviderRecord[]>;
+
+  /** Create a new DNS record at the provider; returns the created record (with id). */
+  createRecord(domain: string, record: IProviderRecordInput): Promise<IProviderRecord>;
+
+  /** Update an existing record by provider id; returns the updated record. */
+  updateRecord(
+    domain: string,
+    providerRecordId: string,
+    record: IProviderRecordInput,
+  ): Promise<IProviderRecord>;
+
+  /** Delete a record by provider id. */
+  deleteRecord(domain: string, providerRecordId: string): Promise<void>;
+}