feat: redesign assessment flow — no validation delay, emotional check-in

Questions flow without any validation feedback. Gemini evaluation runs
in background during the call. After all cognitive questions, asks an
emotional check-in question. By the time user answers it, evaluations
are done and results are summarized back to the user.

Author: Sonra0

prisma/migrations/20260308010000_add_emotional_response/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "AssessmentSession" ADD COLUMN "emotionalResponse" TEXT;

prisma/schema.prisma

@@ -184,9 +184,10 @@ model AssessmentSession {
   status           AssessmentStatus   @default(PENDING)
   summary          String?
   severity         AssessmentSeverity?
-  twilioCallSid    String?
-  answers          AssessmentAnswer[]
-  createdAt        DateTime           @default(now())
+  twilioCallSid      String?
+  emotionalResponse  String?
+  answers            AssessmentAnswer[]
+  createdAt          DateTime           @default(now())
 }
 
 model AssessmentAnswer {