Add Prisma integration with SQLite, update dependencies, and configure Svelte

prisma/schema.prisma

@@ -0,0 +1,46 @@
+// This is your Prisma schema file,
+// learn more about it in the docs: https://pris.ly/d/prisma-schema
+
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "sqlite"
+}
+
+model Year {
+  year Int @id
+
+  people Person[]
+}
+
+model Person {
+  id   Int    @id @default(autoincrement())
+  name String
+
+  yearId Int
+  year   Year @relation(fields: [yearId], references: [year])
+
+  gifts Gift[]
+}
+
+model Gift {
+  id          Int        @id @default(autoincrement())
+  name        String
+  url         String?
+  description String?
+  price       Float?
+  status      GiftStatus @default(PLANNED)
+
+  personId Int
+  person   Person @relation(fields: [personId], references: [id])
+}
+
+enum GiftStatus {
+  PLANNED
+  BUY
+  BOUGHT
+  WRAPPED
+  GIVEN
+}