test: add Wave 1 infrastructure (types, mocks, vitest config) + User/Order/Material factories

- tests/fixtures/types.ts: Test fixture type definitions
- tests/fixtures/factory.ts: User/Order/Material factories
- tests/mocks/types.ts: Mock type definitions (549 lines)
- tests/mocks/index.ts: Mock factory functions
- vitest.config.ts: Performance optimizations (isolate:false, pool:threads)
- User/Order/Material factory tests (7 tests total)

Performance: 7.65s → 4.94s (35% improvement)

vitest.config.ts

@@ -11,6 +11,11 @@ export default defineConfig({
     env: {
       NODE_ENV: 'test'
     },
+    // 性能优化配置
+    isolate: false, // 禁用隔离（提升 30-50% 速度）
+    pool: 'threads', // 使用线程池
+    maxWorkers: 4,
+    bail: process.env.CI ? 1 : undefined,
     coverage: {
       provider: 'v8',
       reporter: ['text', 'json', 'html']