feat: initialize finance project with Fastify, Prisma, and Zod

- Added package.json with necessary dependencies and scripts for development and production.
- Created Prisma schema for BankAccount model with fields: id, name, bankName, accountNumber, createdAt, and updatedAt.
- Implemented Fastify server with CRUD operations for bank accounts, including validation using Zod.
- Added graceful shutdown handling for server and Prisma client.

prisma/schema.prisma

@@ -0,0 +1,21 @@
+// prisma/schema.prisma
+
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+model BankAccount {
+  id            Int      @id @default(autoincrement())
+  name          String   // e.g., "Checking Account", "Savings XYZ"
+  bankName      String   // e.g., "Chase", "Wells Fargo"
+  accountNumber String   @unique // Consider encryption in a real app
+  createdAt     DateTime @default(now())
+  updatedAt     DateTime @updatedAt
+
+  @@map("bank_accounts") // Optional: specify table name in snake_case
+}