Add twilio softphone with integrated AI assistant

backend/prisma/migrations/20260103054426_add_integrations_config/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE `tenants` ADD COLUMN `integrationsConfig` JSON NULL;

backend/prisma/schema-central.prisma

@@ -24,17 +24,18 @@ model User {
 }
 
 model Tenant {
-  id          String   @id @default(cuid())
-  name        String
-  slug        String   @unique // Used for identification
-  dbHost      String   // Database host
-  dbPort      Int      @default(3306)
-  dbName      String   // Database name
-  dbUsername  String   // Database username
-  dbPassword  String   // Encrypted database password
-  status      String   @default("active") // active, suspended, deleted
-  createdAt   DateTime @default(now())
-  updatedAt   DateTime @updatedAt
+  id                 String   @id @default(cuid())
+  name               String
+  slug               String   @unique // Used for identification
+  dbHost             String   // Database host
+  dbPort             Int      @default(3306)
+  dbName             String   // Database name
+  dbUsername         String   // Database username
+  dbPassword         String   // Encrypted database password
+  integrationsConfig Json?    // Encrypted JSON config for external services (Twilio, OpenAI, etc.)
+  status             String   @default("active") // active, suspended, deleted
+  createdAt          DateTime @default(now())
+  updatedAt          DateTime @updatedAt
 
   domains     Domain[]