fix: resolve Prisma 'vector' deserialization error and missing PDF canvas dependency

memento-note/prisma/schema.prisma

@@ -1,11 +1,12 @@
 generator client {
-  provider      = "prisma-client-js"
-  binaryTargets = ["debian-openssl-3.0.x", "native"]
+  provider        = "prisma-client-js"
+  previewFeatures = ["debian-openssl-3.0.x", "native", "postgresqlExtensions"]
 }
 
 datasource db {
-  provider = "postgresql"
-  url      = env("DATABASE_URL")
+  provider   = "postgresql"
+  url        = env("DATABASE_URL")
+  extensions = [pgvector]
 }
 
 model User {
@@ -315,8 +316,8 @@ model UserAISettings {
 
 model NoteEmbedding {
   id        String   @id @default(cuid())
-  noteId    String   @unique
-  embedding String
+  noteId    String                         @unique
+  embedding Unsupported("vector(1536)")?
   createdAt DateTime @default(now())
   note      Note     @relation(fields: [noteId], references: [id], onDelete: Cascade)