FRE-4517, FRE-4499: Complete SpamShield implementation and billing updates

- SpamFeedback table migration with timestamp index
- Real-time interception engine completion
- Billing service enhancements
- Classifier and rule engine updates

Co-Authored-By: Paperclip <noreply@paperclip.ing>

services/spamshield/src/index.ts

@@ -5,3 +5,4 @@ export * from './utils/phone-validation';
 export * from './carriers';
 export * from './engine';
 export * from './websocket';
+export * from './classifier/sms-classifier';