build(docker): add db:generate step before building

Ensure Prisma client and schemas are generated before building the application to prevent runtime errors

apps/api/Dockerfile

@@ -35,6 +35,10 @@ RUN npm ci
 
 # Build the project
 COPY --from=pruner /app/out/full/ .
+
+# Generate Prisma client and schemas before building
+RUN npm run db:generate --workspace=@repo/db
+
 RUN turbo run build --filter=api...
 
 FROM base AS runner