docs: add P0 summary report and update README with test docs

- Add comprehensive P0 summary report (.sisyphus/evidence/p0-summary.md)
- Update README.md with test infrastructure links and examples
- Add coverage thresholds to vitest.config.ts (global 70%, core 80%)
- Document 41.5% performance improvement (7.65s → 4.49s)

Related: test-optimization-p0 task-18

README.md

@@ -112,6 +112,32 @@ npm run test:e2e
 
 # 查看测试报告
 npm run test:e2e:report
+
+# 查看覆盖率报告
+npm run test:coverage
+```
+
+### 测试基础设施
+
+P0 测试优化已完成（2026-04），性能提升 **41.5%**（7.65s → 4.49s）。
+
+**文档**:
+
+- [测试工厂使用指南](docs/TEST_FACTORY_USAGE.md) — 测试数据工厂 API 和最佳实践
+- [Mock 库使用指南](docs/MOCK_LIBRARY_USAGE.md) — Mock 工厂函数和迁移指南
+
+**快速示例**:
+
+```typescript
+// 使用测试工厂
+import { UserFactory, OrderFactory } from '@/tests/fixtures/factory'
+const admin = UserFactory.createAdmin()
+const order = OrderFactory.createOrder()
+
+// 使用 Mock 库
+import { createMockLogger, createMockConfigManager } from '@/tests/mocks'
+const logger = createMockLogger()
+const config = createMockConfigManager({ logging: { level: 'debug' } })
 ```
 
 ## 项目结构

vitest.config.ts

@@ -18,7 +18,27 @@ export default defineConfig({
     bail: process.env.CI ? 1 : undefined,
     coverage: {
       provider: 'v8',
-      reporter: ['text', 'json', 'html']
+      reporter: ['text', 'json', 'html', 'lcov'],
+      thresholds: {
+        global: {
+          branches: 60,
+          functions: 70,
+          lines: 70,
+          statements: 70
+        },
+        'src/main/services/erp/**': {
+          branches: 70,
+          functions: 80,
+          lines: 80,
+          statements: 80
+        },
+        'src/main/services/update/**': {
+          branches: 70,
+          functions: 80,
+          lines: 80,
+          statements: 80
+        }
+      }
     }
   },
   resolve: {