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/tokens.ts

@@ -0,0 +1,56 @@
+/**
+ * @zh 数据库驱动服务令牌
+ * @en Database driver service tokens
+ *
+ * @zh 用于依赖注入的服务令牌定义
+ * @en Service token definitions for dependency injection
+ */
+
+import type { IMongoConnection } from './drivers/MongoConnection.js'
+import type { IRedisConnection } from './drivers/RedisConnection.js'
+
+// =============================================================================
+// 服务令牌类型 | Service Token Type
+// =============================================================================
+
+/**
+ * @zh 服务令牌
+ * @en Service token
+ */
+export interface ServiceToken<T> {
+    readonly id: string
+    readonly _type?: T
+}
+
+/**
+ * @zh 创建服务令牌
+ * @en Create service token
+ */
+export function createServiceToken<T>(id: string): ServiceToken<T> {
+    return { id }
+}
+
+// =============================================================================
+// 连接令牌 | Connection Tokens
+// =============================================================================
+
+/**
+ * @zh MongoDB 连接令牌
+ * @en MongoDB connection token
+ *
+ * @example
+ * ```typescript
+ * // 注册
+ * services.register(MongoConnectionToken, mongoConnection)
+ *
+ * // 获取
+ * const mongo = services.get(MongoConnectionToken)
+ * ```
+ */
+export const MongoConnectionToken = createServiceToken<IMongoConnection>('database:mongo')
+
+/**
+ * @zh Redis 连接令牌
+ * @en Redis connection token
+ */
+export const RedisConnectionToken = createServiceToken<IRedisConnection>('database:redis')