feat: v0.6.1 — AriaEngine 可选自研 KVStore 后端（storageBackend: 'kv'）+ KVStore APPEND 日志类型 + 10 个 aria+kv 集成测试 + 文档全量同步

src/engine/aria/index.ts

@@ -22,6 +22,7 @@ import { DatabaseLock } from './locks';
 import { WALRecordType, type WALRecord } from './types';
 import { CheckpointManager } from './wal/checkpoint';
 import { MemoryBackend, type IStorageBackend } from './store/backend';
+import { KVStoreBackend } from './store/kvstore_backend';
 import { OPFSBackend } from './store/opfs_backend';
 import { EncryptedBackend } from './store/encrypted_backend';
 import { PageSSTableStore } from './store/page_sstable_store';
@@ -117,6 +118,9 @@ export class AriaEngine implements IStorageEngine {
     let baseBackend: IStorageBackend;
     if (this.config.storageBackend === 'opfs') {
       baseBackend = new OPFSBackend();
+    } else if (this.config.storageBackend === 'kv') {
+      // v0.6.1: 自研 KVStore 后端（aria 完全跑在自研存储栈上，不依赖浏览器 OPFS）
+      baseBackend = new KVStoreBackend();
     } else {
       baseBackend = new MemoryBackend();
     }