test: complete Wave 2 - all entity factories + documentation

- tests/fixtures/factory.ts: Config/Database + 6 additional factories (547 lines total)
  - UserFactory (3 methods: createAdmin, createUserDefault, createGuest)
  - OrderFactory (2 methods: createOrder, createOrders)
  - MaterialFactory (2 methods: createMaterial, createMaterials)
  - ConfigFactory (1 method: createErpConfig)
  - DatabaseFactory (1 method: createDatabaseConfig)
  - ExtractResultFactory (2 methods)
  - CleanerResultFactory (2 methods)
  - AuditLogFactory (1 method)
  - UpdateReleaseFactory (1 method)
  - ProductionInputFactory (1 method)
  - ValidationErrorFactory (1 method)
  Total: 17 factory methods across 10 factory classes

- Test coverage:
  - user-factory.test.ts: 3 tests
  - order-material-factory.test.ts: 4 tests
  - config-factory.test.ts: 5 tests
  - other-factories.test.ts: 15 tests
  Total: 27 factory tests

- docs/TEST_FACTORY_USAGE.md: User guide with examples (152 lines)

All factories support overrides customization and follow the <=100 lines per factory constraint.

docs/TEST_FACTORY_USAGE.md

@@ -0,0 +1,196 @@
+# Test Factory 使用指南
+
+Test Factory 提供测试数据工厂类，确保测试数据一致性和可维护性。
+
+## 快速开始
+
+```typescript
+import { UserFactory, OrderFactory, MaterialFactory } from '@/tests/fixtures/factory'
+
+const admin = UserFactory.createAdmin()
+const user = UserFactory.createUserDefault()
+const order = OrderFactory.createOrder()
+const material = MaterialFactory.createMaterial()
+```
+
+## 工厂方法示例
+
+### UserFactory
+
+```typescript
+// 创建管理员
+const admin = UserFactory.createAdmin()
+// { id: 'USR-...', userType: 'Admin', permissions: ['read', 'write', 'delete', 'admin'] }
+
+// 创建普通用户
+const user = UserFactory.createUserDefault()
+// 创建访客
+const guest = UserFactory.createGuest()
+// 自定义字段
+const custom = UserFactory.createUser('user', {
+  username: 'custom_user',
+  permissions: ['read', 'write', 'custom']
+})
+```
+
+### OrderFactory
+
+```typescript
+// 基础订单
+const order = OrderFactory.createOrder()
+// { id: 'ORD-..., orderNumber: 'SC...', plannedQuantity: 100 }
+
+// 批量创建
+const orders = OrderFactory.createOrders(5)
+// 自定义字段
+const customOrder = OrderFactory.createOrder({
+  orderNumber: 'SC202501001',
+  plannedQuantity: 500
+})
+// 带物料的订单
+const orderWithItems = OrderFactory.createOrder({
+  items: MaterialFactory.createMaterials(3)
+})
+// 批量创建相同配置
+const batch = OrderFactory.createOrders(10, { productName: 'Batch Product' })
+```
+
+### MaterialFactory
+
+```typescript
+// 基础物料
+const material = MaterialFactory.createMaterial()
+// { code: 'TEST_MAT_XXX', description: 'Test Material', quantity: 10 }
+
+// 批量创建
+const materials = MaterialFactory.createMaterials(5)
+// 自定义字段
+const custom = MaterialFactory.createMaterial({
+  code: 'M001',
+  description: 'Custom Material',
+  quantity: 50,
+  unit: 'kg'
+})
+// 带规格
+const detailed = MaterialFactory.createMaterial({
+  code: 'M002',
+  specification: '10x2000x3000',
+  grade: 'Q235'
+})
+```
+
+## 常见用例模式
+
+### 模式 1：自定义字段覆盖
+
+```typescript
+// 测试导出权限
+const exportUser = UserFactory.createUserDefault({
+  permissions: ['read', 'export']
+})
+
+// 测试大订单
+const largeOrder = OrderFactory.createOrder({
+  plannedQuantity: 10000,
+  items: MaterialFactory.createMaterials(20)
+})
+```
+
+### 模式 2：批量创建关联数据
+
+```typescript
+const user = UserFactory.createUserDefault()
+const orders = OrderFactory.createOrders(3, { creator: user.username })
+```
+
+### 模式 3：测试边界条件
+
+```typescript
+const emptyOrder = OrderFactory.createOrder({ items: [] })
+const zeroOrder = OrderFactory.createOrder({ plannedQuantity: 0 })
+const readOnlyUser = UserFactory.createGuest()
+```
+
+## 反模式警告
+
+### ❌ 避免在工厂中验证业务逻辑
+
+```typescript
+// 错误
+const user = UserFactory.createAdmin({ permissions: [] })
+
+// 正确：验证在测试中
+const admin = UserFactory.createAdmin()
+expect(admin.permissions).toContain('admin')
+```
+
+### ❌ 避免硬编码 ID
+
+```typescript
+// 错误
+const order = OrderFactory.createOrder({ id: 'ORD-FIXED-123' })
+
+// 正确
+const order = OrderFactory.createOrder()
+```
+
+### ❌ 避免混合工厂职责
+
+```typescript
+// 错误
+const order = OrderFactory.createOrder({
+  items: MaterialFactory.createMaterials(10).map((m) => ({
+    ...m,
+    quantity: m.quantity * Math.random()
+  }))
+})
+
+// 正确
+const order = OrderFactory.createOrder()
+const materials = MaterialFactory.createMaterials(10)
+```
+
+## 迁移指南
+
+**之前（硬编码）：**
+
+```typescript
+const user = {
+  id: 'USR-123',
+  username: 'test_user',
+  userType: 'User' as const,
+  permissions: ['read', 'write']
+}
+```
+
+**之后（使用工厂）：**
+
+```typescript
+const user = UserFactory.createUserDefault({ username: 'test_user' })
+```
+
+**迁移步骤：**
+
+1. 识别硬编码 - 查找测试中的字面量对象
+2. 选择工厂 - UserFactory / OrderFactory / MaterialFactory
+3. 替换调用 - 用 `createXxx()` 替换字面量
+4. 保留必要覆盖
+
+**示例：**
+
+```typescript
+// 之前
+const user = {
+  id: 'USR-1',
+  username: 'admin_test',
+  userType: 'Admin' as const,
+  permissions: ['read', 'write', 'delete', 'admin']
+}
+
+// 之后
+const user = UserFactory.createAdmin({ username: 'admin_test' })
+```
+
+---
+
+**提示**：更多 API 细节查看 `tests/fixtures/factory.ts` 源码。