chore: Add postinstall script for Prisma client generation and remove outdated client symlink

- Introduce a postinstall script to automatically generate the Prisma client after installation
- Remove the outdated symlink for the Prisma client to streamline project structure and avoid confusion

.prisma/client

@@ -1 +0,0 @@
-../node_modules/.prisma/client

package.json

@@ -14,6 +14,7 @@
     "test:coverage": "jest --coverage",
     "test:ci": "jest --ci --coverage --maxWorkers=2",
     "db:generate": "prisma generate",
+    "postinstall": "prisma generate",
     "db:migrate": "prisma migrate dev",
     "db:push": "prisma db push",
     "db:studio": "prisma studio",

prisma/schema.prisma

@@ -3,7 +3,6 @@
 
 generator client {
   provider = "prisma-client-js"
-  output   = "../node_modules/@prisma/client/.prisma/client"
 }
 
 datasource db {