Remove Prisma from project

- Remove @prisma/client and prisma dependencies
- Delete prisma schema and database files
- Remove database context from tRPC
- Clean up Prisma-related scripts and environment variables
- Update README to remove Prisma reference

The project no longer requires a database and builds successfully.

.env.example

@@ -1,10 +1,6 @@
 # When adding additional environment variables, the schema in "/src/env.js"
 # should be updated accordingly.
 
-# Prisma
-# https://www.prisma.io/docs/reference/database-reference/connection-urls#env
-
-
 REPO_URL="https://github.com/community-scripts/ProxmoxVE"
 REPO_BRANCH="main"
 SCRIPTS_DIRECTORY="scripts"