chore: update @prisma/client to version 7.10.0 and add prisma.config.ts for configuration management

- Updated @prisma/client in shared package.json from ^6.0.0 to ^7.10.0.
- Modified stack.md to include generated Prisma client directory and Prisma CLI config file.
- Added prisma.config.ts for managing Prisma configuration, including datasource URL and migrations path.

apps/api/prisma/schema.prisma

@@ -1,12 +1,12 @@
 // Gruperly - Prisma Schema (PostgreSQL)
 
 generator client {
-  provider = "prisma-client-js"
+  provider = "prisma-client"
+  output   = "./generated/prisma"
 }
 
 datasource db {
   provider = "postgresql"
-  url      = env("DATABASE_URL")
 }
 
 // Auth (Better Auth) - required tables