feat: migrate SMS/voice to Telnyx (TeXML), keep browser dial pad on Twilio

Twilio now handles only the in-browser dial pad (Access Token + browser-Device
outbound TwiML); Telnyx takes over SMS, inbound voicemail, the AI voice
conversation loop, and staff-triggered outbound calls via TeXML. Adds
TelnyxSettings model, Communication.provider discriminator, new comms/routes
modules, and a real Telnyx Settings page.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

packages/db/shared/schemas/objects/CommunicationUncheckedCreateWithoutUserInput.schema.ts

@@ -2,7 +2,8 @@ import * as z from 'zod';
 import type { Prisma } from '../../../generated/prisma';
 import { CommunicationChannelSchema } from '../enums/CommunicationChannel.schema';
 import { CommunicationDirectionSchema } from '../enums/CommunicationDirection.schema';
-import { CommunicationStatusSchema } from '../enums/CommunicationStatus.schema'
+import { CommunicationStatusSchema } from '../enums/CommunicationStatus.schema';
+import { CommunicationProviderSchema } from '../enums/CommunicationProvider.schema'
 
 const makeSchema = () => z.object({
   id: z.number().int().optional(),
@@ -10,6 +11,7 @@ const makeSchema = () => z.object({
   channel: CommunicationChannelSchema,
   direction: CommunicationDirectionSchema,
   status: CommunicationStatusSchema,
+  provider: CommunicationProviderSchema.optional(),
   body: z.string().optional().nullable(),
   callDuration: z.number().int().optional().nullable(),
   twilioSid: z.string().optional().nullable(),