feat: Add image and record stream download actions

Introduces BaseDownloadStream as a shared base class for streaming file downloads. Adds DownloadFileImageStream and DownloadFileRecordStream for image and audio file streaming with support for format conversion. Refactors DownloadFileStream to use the new base class, and updates action registration and router to include the new actions.

src/onebot/action/stream/DownloadFileImageStream.ts

@@ -0,0 +1,60 @@
+import { ActionName } from '@/onebot/action/router';
+import { OneBotRequestToolkit } from '@/onebot/action/OneBotAction';
+import { Static, Type } from '@sinclair/typebox';
+import { NetworkAdapterConfig } from '@/onebot/config/config';
+import { StreamPacket, StreamStatus } from './StreamBasic';
+import fs from 'fs';
+import { imageSizeFallBack } from '@/image-size';
+import { BaseDownloadStream, DownloadResult } from './BaseDownloadStream';
+
+const SchemaData = Type.Object({
+    file: Type.Optional(Type.String()),
+    file_id: Type.Optional(Type.String()),
+    chunk_size: Type.Optional(Type.Number({ default: 64 * 1024 })) // 默认64KB分块
+});
+
+type Payload = Static<typeof SchemaData>;
+
+export class DownloadFileImageStream extends BaseDownloadStream<Payload, DownloadResult> {
+    override actionName = ActionName.DownloadFileImageStream;
+    override payloadSchema = SchemaData;
+    override useStream = true;
+
+    async _handle(payload: Payload, _adaptername: string, _config: NetworkAdapterConfig, req: OneBotRequestToolkit): Promise<StreamPacket<DownloadResult>> {
+        try {
+            payload.file ||= payload.file_id || '';
+            const chunkSize = payload.chunk_size || 64 * 1024;
+
+            const { downloadPath, fileName, fileSize } = await this.resolveDownload(payload.file);
+
+            const stats = await fs.promises.stat(downloadPath);
+            const totalSize = fileSize || stats.size;
+            const { width, height } = await imageSizeFallBack(downloadPath);
+
+            // 发送文件信息（与 DownloadFileStream 对齐，但包含宽高）
+            await req.send({
+                type: StreamStatus.Stream,
+                data_type: 'file_info',
+                file_name: fileName,
+                file_size: totalSize,
+                chunk_size: chunkSize,
+                width,
+                height
+            });
+
+            const { totalChunks, totalBytes } = await this.streamFileChunks(req, downloadPath, chunkSize, 'file_chunk');
+
+            // 返回完成状态（与 DownloadFileStream 对齐）
+            return {
+                type: StreamStatus.Response,
+                data_type: 'file_complete',
+                total_chunks: totalChunks,
+                total_bytes: totalBytes,
+                message: 'Download completed'
+            };
+
+        } catch (error) {
+            throw new Error(`Download failed: ${(error as Error).message}`);
+        }
+    }
+}