refactor(prisma): 统一导入prisma客户端方式

- 所有控制器中从libs/prisma.ts导入prisma替代旧的libs/db.ts
- 规范了step模块中zod验证架构的格式与换行
- 生成Prisma客户端及类型定义文件，包含browser、client、commonInputTypes、enums和内部类文件
- 优化listStepsQuerySchema默认参数与链式调用格式
- 保持代码风格一致，提升可维护性和类型安全性

apps/server/libs/db.ts

@@ -1,7 +0,0 @@
-import { PrismaClient } from '../generated/prisma/index.js'
-
-const prismaClientSingleton = () => {
-  return new PrismaClient();
-};
-
-export default prismaClientSingleton();

apps/server/libs/prisma.ts

@@ -0,0 +1,8 @@
+import 'dotenv/config';
+import { PrismaBetterSqlite3 } from '@prisma/adapter-better-sqlite3';
+import { PrismaClient } from '../generated/client.ts';
+
+const connectionString = `${process.env.DATABASE_URL}`;
+
+const adapter = new PrismaBetterSqlite3({ url: connectionString });
+export const prisma = new PrismaClient({ adapter });