refactor(database): remove zod generator from prisma schema

The zod generator configuration was removed as it's no longer needed in the project, simplifying the schema file.

packages/database/prisma/schema.prisma

@@ -9,18 +9,6 @@ generator client {
   output   = "../generated/prisma"
 }
 
-generator zod {
-  provider                 = "zod-prisma-types"
-  output                   = "../generated/zod"
-  writeBarrelFiles         = false // default is true
-  createInputTypes         = false // default is true
-  createModelTypes         = true // default is true
-  addInputTypeValidation   = false // default is true
-  addIncludeType           = false // default is true
-  addSelectType            = false // default is true
-  validateWhereUniqueInput = false // default is true
-}
-
 generator json {
   provider = "prisma-json-types-generator"
 }