fix(ci): include prisma generation in backend and fix soroban error attribute

Author: Your Name

.github/workflows/ci.yml

@@ -22,6 +22,7 @@ jobs:
           cache: 'npm'
           cache-dependency-path: backend/package-lock.json
       - run: npm install
+      - run: npx prisma generate
       - run: npm run build
       - run: npm test
 

contracts/src/token.rs

@@ -7,7 +7,7 @@ enum DataKey {
     Balance(Address),
 }
 
-#[contracttype]
+#[contracterror]
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub enum TokenError {
     AlreadyInitialized = 1,