fix: correct mapping name from 'systemParams' to 'systemParam' in SystemParam model

prisma/mongo/schema/system-param.prisma

@@ -31,5 +31,5 @@ model SystemParam {
   @@index([side, dataType])
   @@unique([side, name]) // avoid duplicate key names under same side
 
-  @@map("systemParams")
+  @@map("systemParam")
 }