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/findManyUser.schema.ts

@@ -35,6 +35,7 @@ export const UserFindManySelectSchema: z.ZodType<Prisma.UserSelect> = z.object({
     cloudFiles: z.boolean().optional(),
     communications: z.boolean().optional(),
     twilioSettings: z.boolean().optional(),
+    telnyxSettings: z.boolean().optional(),
     aiSettings: z.boolean().optional(),
     officeHours: z.boolean().optional(),
     officeContact: z.boolean().optional(),
@@ -72,6 +73,7 @@ export const UserFindManySelectZodSchema = z.object({
     cloudFiles: z.boolean().optional(),
     communications: z.boolean().optional(),
     twilioSettings: z.boolean().optional(),
+    telnyxSettings: z.boolean().optional(),
     aiSettings: z.boolean().optional(),
     officeHours: z.boolean().optional(),
     officeContact: z.boolean().optional(),