ringgroups: ring-all and hunt groups, API, page, golden case

/api/ring-groups CRUD with members as ordered memberIds (unique, must
exist), number from the ring-group range, a no-answer destination
(never itself), and delete refused while something points at it. The
generator renders sp-rg-{id} (Dial through sp-rg-member: all at once with
the total ring time, or one at a time with the per-member time, music
instead of ringing on request), adds the number to sp-local-numbers, and
destApp sends ring_group destinations there. Golden case ringgroups.

The DestinationPicker is now generic over targets picked by id and gains
"Voicemail of a user" and "Ring group" (M6-T6 completes it). Caller-name
prefixes (DIDs and ring groups) get a space before the caller's name.
Ring groups page with an ordered member list.

e2e m6-t2 found the new-group form failing on an unset no-answer
destination (fixed: defaults to hang up). It checks ring-all (both ring,
191 answers) and hunt (190 alone for 5 s, then 191) with real calls. The
generator debounce test now waits for the apply instead of a fixed 150 ms.

Task: M6-T2

packages/shared/src/index.ts

@@ -12,3 +12,4 @@ export * from './dids.ts';
 export * from './outbound.ts';
 export * from './voicemail.ts';
 export * from './sounds.ts';
+export * from './ringgroups.ts';

packages/shared/src/ringgroups.ts

@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+// Ring groups (02 ring_groups, 03 §6.7): one number that rings several people.
+import { z } from 'zod';
+import { DestinationSchema, type Destination } from './destination.ts';
+import { InternalNumber } from './extensions.ts';
+
+export const RING_STRATEGIES = ['ringall', 'hunt'] as const;
+
+const RingGroupFields = z.object({
+  number: InternalNumber,
+  name: z.string().trim().min(1, 'Required').max(40),
+  /** ringall: everyone at once; hunt: one at a time, in member order. */
+  strategy: z.enum(RING_STRATEGIES),
+  /** Per member for hunt, total for ringall. */
+  ringSeconds: z.number().int().min(5).max(300),
+  /** Shown before the caller's name, e.g. "Sales: ". Same rules as caller ID names (03 §2). */
+  callerIdNamePrefix: z
+    .string()
+    .max(20)
+    .regex(/^[^"'\\;,()[\]{}$<>|]*$/, 'No quotes, commas, brackets or ; $ < > |')
+    .nullable(),
+  musicInsteadOfRing: z.boolean(),
+  /** Extension ids, in ring order. */
+  memberIds: z
+    .array(z.uuid())
+    .max(50)
+    .refine((ids) => new Set(ids).size === ids.length, 'Someone is listed twice'),
+  noAnswerDestination: DestinationSchema,
+});
+
+export const RingGroupCreateSchema = RingGroupFields.partial().required({
+  number: true,
+  name: true,
+  noAnswerDestination: true,
+});
+export const RingGroupUpdateSchema = RingGroupFields.partial();
+export type RingGroupCreate = z.input<typeof RingGroupCreateSchema>;
+export type RingGroupUpdate = z.input<typeof RingGroupUpdateSchema>;
+
+export type RingGroupDto = z.output<typeof RingGroupFields> & {
+  id: string;
+  noAnswerDestination: Destination;
+  noAnswerSummary: string;
+  createdAt: string;
+};