feat(database): add database layer architecture (#410)

- Add @esengine/database-drivers for MongoDB/Redis connection management
- Add @esengine/database for Repository pattern with CRUD, pagination, soft delete
- Refactor @esengine/transaction MongoStorage to use shared connection
- Add comprehensive documentation in Chinese and English

packages/framework/database/src/index.ts

@@ -0,0 +1,152 @@
+/**
+ * @zh @esengine/database 数据库操作层
+ * @en @esengine/database Database Operations Layer
+ *
+ * @zh 提供通用的数据库 CRUD 操作、仓库模式、用户管理等功能
+ * @en Provides generic database CRUD operations, repository pattern, user management
+ *
+ * @example
+ * ```typescript
+ * import { createMongoConnection } from '@esengine/database-drivers'
+ * import {
+ *     Repository,
+ *     UserRepository,
+ *     createUserRepository,
+ *     hashPassword,
+ *     verifyPassword,
+ * } from '@esengine/database'
+ *
+ * // 1. 创建连接（来自 database-drivers）
+ * const mongo = createMongoConnection({
+ *     uri: 'mongodb://localhost:27017',
+ *     database: 'game',
+ * })
+ * await mongo.connect()
+ *
+ * // 2. 使用用户仓库
+ * const userRepo = createUserRepository(mongo)
+ *
+ * // 注册
+ * const user = await userRepo.register({
+ *     username: 'player1',
+ *     password: 'securePassword123',
+ * })
+ *
+ * // 登录
+ * const authUser = await userRepo.authenticate('player1', 'securePassword123')
+ *
+ * // 3. 自定义仓库
+ * interface Player extends BaseEntity {
+ *     name: string
+ *     score: number
+ *     level: number
+ * }
+ *
+ * class PlayerRepository extends Repository<Player> {
+ *     constructor(connection: IMongoConnection) {
+ *         super(connection, 'players')
+ *     }
+ *
+ *     async findTopPlayers(limit = 10): Promise<Player[]> {
+ *         return this.findMany({
+ *             sort: { score: 'desc' },
+ *             limit,
+ *         })
+ *     }
+ *
+ *     async addScore(playerId: string, points: number): Promise<Player | null> {
+ *         const player = await this.findById(playerId)
+ *         if (!player) return null
+ *         return this.update(playerId, { score: player.score + points })
+ *     }
+ * }
+ *
+ * // 4. 分页查询
+ * const result = await userRepo.findPaginated(
+ *     { page: 1, pageSize: 20 },
+ *     { where: { isActive: true }, sort: { createdAt: 'desc' } }
+ * )
+ * console.log(`第 ${result.page}/${result.totalPages} 页，共 ${result.total} 条`)
+ * ```
+ */
+
+// =============================================================================
+// Types | 类型
+// =============================================================================
+
+export type {
+    BaseEntity,
+    SoftDeleteEntity,
+    ComparisonOperators,
+    WhereCondition,
+    SortDirection,
+    SortCondition,
+    QueryOptions,
+    PaginationParams,
+    PaginatedResult,
+    IRepository,
+    UserEntity
+} from './types.js'
+
+// =============================================================================
+// Repository | 仓库
+// =============================================================================
+
+export { Repository, createRepository } from './Repository.js'
+
+// =============================================================================
+// User Repository | 用户仓库
+// =============================================================================
+
+export {
+    UserRepository,
+    createUserRepository,
+    type CreateUserParams,
+    type SafeUser
+} from './UserRepository.js'
+
+// =============================================================================
+// Password | 密码工具
+// =============================================================================
+
+export {
+    hashPassword,
+    verifyPassword,
+    checkPasswordStrength,
+    type PasswordHashConfig,
+    type PasswordStrength,
+    type PasswordStrengthResult
+} from './password.js'
+
+// =============================================================================
+// Tokens | 服务令牌
+// =============================================================================
+
+export {
+    MongoConnectionToken,
+    RedisConnectionToken,
+    UserRepositoryToken,
+    createServiceToken,
+    type ServiceToken
+} from './tokens.js'
+
+// =============================================================================
+// Re-exports from database-drivers | 从 database-drivers 重新导出
+// =============================================================================
+
+export type {
+    IMongoConnection,
+    IRedisConnection,
+    MongoConnectionConfig,
+    RedisConnectionConfig,
+    ConnectionState,
+    DatabaseErrorCode
+} from '@esengine/database-drivers'
+
+export {
+    createMongoConnection,
+    createRedisConnection,
+    DatabaseError,
+    ConnectionError,
+    DuplicateKeyError
+} from '@esengine/database-drivers'