feat(job-completion): add message and photo upload to job completion

prisma/migrations/20260113102925_add_completion_details/migration.sql

@@ -0,0 +1,3 @@
+-- AlterTable
+ALTER TABLE "Booking" ADD COLUMN "completionImage" TEXT;
+ALTER TABLE "Booking" ADD COLUMN "completionMessage" TEXT;

prisma/schema.prisma

@@ -34,6 +34,9 @@ model Booking {
   completedAt DateTime?
   createdAt  DateTime @default(now())
   
+  completionMessage String?
+  completionImage   String?
+
   @@unique([planId, date, sitterName])
 }