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-drivers/src/index.ts

@@ -0,0 +1,117 @@
+/**
+ * @zh @esengine/database-drivers 数据库连接驱动
+ * @en @esengine/database-drivers Database Connection Drivers
+ *
+ * @zh 提供 MongoDB、Redis 等数据库的连接管理，支持连接池、自动重连和事件通知
+ * @en Provides connection management for MongoDB, Redis, etc. with pooling, auto-reconnect, and events
+ *
+ * @example
+ * ```typescript
+ * import {
+ *     createMongoConnection,
+ *     createRedisConnection,
+ *     MongoConnectionToken,
+ *     RedisConnectionToken,
+ * } from '@esengine/database-drivers'
+ *
+ * // 创建 MongoDB 连接
+ * const mongo = createMongoConnection({
+ *     uri: 'mongodb://localhost:27017',
+ *     database: 'game',
+ *     pool: { minSize: 5, maxSize: 20 },
+ *     autoReconnect: true,
+ * })
+ *
+ * mongo.on('connected', () => console.log('MongoDB connected'))
+ * mongo.on('error', (e) => console.error('Error:', e.error))
+ *
+ * await mongo.connect()
+ *
+ * // 直接使用
+ * const users = mongo.collection('users')
+ * await users.insertOne({ name: 'test' })
+ *
+ * // 或注册到服务容器供其他模块使用
+ * services.register(MongoConnectionToken, mongo)
+ *
+ * // 创建 Redis 连接
+ * const redis = createRedisConnection({
+ *     host: 'localhost',
+ *     port: 6379,
+ *     keyPrefix: 'game:',
+ * })
+ *
+ * await redis.connect()
+ * await redis.set('session:123', 'data', 3600)
+ *
+ * // 断开连接
+ * await mongo.disconnect()
+ * await redis.disconnect()
+ * ```
+ */
+
+// =============================================================================
+// Types | 类型
+// =============================================================================
+
+export type {
+    ConnectionState,
+    IConnection,
+    IEventableConnection,
+    ConnectionEventType,
+    ConnectionEventListener,
+    ConnectionEvent,
+    PoolConfig,
+    MongoConnectionConfig,
+    RedisConnectionConfig,
+    DatabaseErrorCode
+} from './types.js'
+
+export {
+    DatabaseError,
+    ConnectionError,
+    DuplicateKeyError
+} from './types.js'
+
+// =============================================================================
+// Drivers | 驱动
+// =============================================================================
+
+export {
+    MongoConnection,
+    createMongoConnection,
+    type IMongoConnection
+} from './drivers/index.js'
+
+export {
+    RedisConnection,
+    createRedisConnection,
+    type IRedisConnection
+} from './drivers/index.js'
+
+// =============================================================================
+// Interfaces | 接口
+// =============================================================================
+
+export type {
+    IMongoCollection,
+    IMongoDatabase,
+    InsertOneResult,
+    InsertManyResult,
+    UpdateResult,
+    DeleteResult,
+    FindOptions,
+    FindOneAndUpdateOptions,
+    IndexOptions
+} from './drivers/index.js'
+
+// =============================================================================
+// Tokens | 服务令牌
+// =============================================================================
+
+export {
+    MongoConnectionToken,
+    RedisConnectionToken,
+    createServiceToken,
+    type ServiceToken
+} from './tokens.js'