feat: phase 4 completed

prisma/migrations/20251224123000_add_encryption/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "Message" ADD COLUMN     "isEncrypted" BOOLEAN NOT NULL DEFAULT false;

prisma/schema.prisma

@@ -50,6 +50,7 @@ model Message {
   title       String
   content     String?      @db.Text
   status      String       @default("DRAFT")
+  isEncrypted Boolean      @default(false)
   lastPing    DateTime     @default(now())
   checkInterval Int        @default(24)
   user        User         @relation(fields: [userId], references: [id], onDelete: Cascade)