numbers: any free internal number of 1 to 6 digits; ranges only suggest

Owner wanted the first user on 1. Numbering ranges now choose the Next free suggestion
(Settings → Numbering), the setup wizard takes a number per person, and a one-digit number
can't also be a menu key of a digital receptionist with direct dialing. Dialplan patterns that
take an internal number match one digit (_X!); golden case short-numbers proves it in Asterisk.

packages/shared/src/extensions.ts

@@ -3,7 +3,8 @@
 // The patterns match the generator's sanitizers (03 §2), so valid input always renders.
 import { z } from 'zod';
 
-export const InternalNumber = z.string().regex(/^\d{3,6}$/, 'Use 3 to 6 digits');
+/** 1 to 6 digits (owner, 2026-10-21: "1" for the first user; the generator's patterns are _X!). */
+export const InternalNumber = z.string().regex(/^\d{1,6}$/, 'Use 1 to 6 digits');
 const Slug = z.string().regex(/^[a-z0-9-]{1,32}$/, 'Lowercase letters, digits and dashes');
 const Pin = z.string().regex(/^\d{4,10}$/, 'Use 4 to 10 digits');
 

packages/shared/src/settings.ts

@@ -5,7 +5,7 @@ import { DestinationSchema } from './destination.ts';
 
 const range = (from: number, to: number) =>
   z
-    .tuple([z.number().int().min(100), z.number().int().max(999999)])
+    .tuple([z.number().int().min(0), z.number().int().max(999999)])
     .refine(([a, b]) => a <= b, 'range start must be <= end')
     .default([from, to]);