fix(admin-service): 本地磁盘存储 + Docker volume 解决 EACCES 权限问题

回退 MinIO 方案，改用本地磁盘存储（与 git 历史及 rwadurian 一致）。
根本原因：容器内无权在 ./uploads 创建目录（EACCES）。
修复方案：
  - UPLOAD_DIR 默认改为 /app/uploads（明确绝对路径）
  - docker-compose 添加命名卷 admin-uploads 挂载到 /app/uploads
  - 挂载卷由 Docker 管理，容器拥有写权限

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/docker-compose.yml

@@ -361,6 +361,9 @@ services:
       - MINIO_BUCKET=app-releases
       - OSS_BASE_URL=https://oss.gogenex.com
       - JWT_ACCESS_SECRET=dev-access-secret-change-in-production
+      - UPLOAD_DIR=/app/uploads
+    volumes:
+      - admin-uploads:/app/uploads
     depends_on:
       postgres:
         condition: service_healthy
@@ -559,6 +562,7 @@ volumes:
   postgres_data:
   redis_data:
   kafka_data:
+  admin-uploads:
 
 networks:
   genex-network:

backend/services/admin-service/src/application/services/file-storage.service.ts

@@ -1,27 +1,19 @@
 import { Injectable, Logger } from '@nestjs/common';
-import * as crypto from 'crypto';
+import * as fs from 'fs/promises';
+import * as fsSync from 'fs';
 import * as path from 'path';
-import { Client as MinioClient } from 'minio';
-import { Readable } from 'stream';
+import * as crypto from 'crypto';
 
 @Injectable()
 export class FileStorageService {
   private readonly logger = new Logger(FileStorageService.name);
-  private readonly minio: MinioClient;
-  private readonly bucket: string;
+  private readonly uploadDir: string;
 
   constructor() {
-    this.bucket = process.env.MINIO_BUCKET || 'app-releases';
-    this.minio = new MinioClient({
-      endPoint: process.env.MINIO_ENDPOINT || 'localhost',
-      port: parseInt(process.env.MINIO_PORT || '9000', 10),
-      useSSL: process.env.MINIO_USE_SSL === 'true',
-      accessKey: process.env.MINIO_ACCESS_KEY || 'minioadmin',
-      secretKey: process.env.MINIO_SECRET_KEY || 'minioadmin',
-    });
+    this.uploadDir = process.env.UPLOAD_DIR || '/app/uploads';
   }
 
-  /** Generate a unique object key for a new upload */
+  /** Generate a unique filename for a new upload */
   generateObjectName(originalName: string, platform: string, versionName: string): string {
     const ext = originalName.split('.').pop() || 'bin';
     const timestamp = Date.now();
@@ -29,24 +21,20 @@ export class FileStorageService {
     return `${platform}-${versionName}-${timestamp}-${random}.${ext}`;
   }
 
-  /** Upload file buffer to MinIO, return size and sha256 */
-  async saveFile(buffer: Buffer, objectName: string): Promise<{ size: number; sha256: string }> {
+  /** Save file buffer to local disk, return size and sha256 */
+  async saveFile(buffer: Buffer, filename: string): Promise<{ size: number; sha256: string }> {
+    await fs.mkdir(this.uploadDir, { recursive: true });
+    const filePath = path.join(this.uploadDir, filename);
     const sha256 = crypto.createHash('sha256').update(buffer).digest('hex');
-    const ext = path.extname(objectName).toLowerCase();
-    const contentType = ext === '.apk'
-      ? 'application/vnd.android.package-archive'
-      : 'application/octet-stream';
-
-    await this.minio.putObject(this.bucket, objectName, buffer, buffer.length, {
-      'Content-Type': contentType,
-    });
-    this.logger.log(`Uploaded to MinIO: ${this.bucket}/${objectName} (${buffer.length} bytes)`);
+    await fs.writeFile(filePath, buffer);
+    this.logger.log(`Saved file: ${filename} (${buffer.length} bytes, sha256: ${sha256})`);
     return { size: buffer.length, sha256 };
   }
 
-  /** Stream a MinIO object to a writable (e.g. Express Response) */
-  async streamFile(objectName: string, destination: NodeJS.WritableStream): Promise<void> {
-    const stream: Readable = await this.minio.getObject(this.bucket, path.basename(objectName));
+  /** Stream local file to a writable (e.g. Express Response) */
+  async streamFile(filename: string, destination: NodeJS.WritableStream): Promise<void> {
+    const filePath = path.join(this.uploadDir, path.basename(filename));
+    const stream = fsSync.createReadStream(filePath);
     await new Promise<void>((resolve, reject) => {
       stream.pipe(destination as any);
       stream.on('end', resolve);
@@ -54,10 +42,11 @@ export class FileStorageService {
     });
   }
 
-  /** Get object size and content-type from MinIO */
-  async statFile(objectName: string): Promise<{ size: number; contentType: string }> {
-    const stat = await this.minio.statObject(this.bucket, path.basename(objectName));
-    const ext = path.extname(objectName).toLowerCase();
+  /** Get file size and content-type from local disk */
+  async statFile(filename: string): Promise<{ size: number; contentType: string }> {
+    const filePath = path.join(this.uploadDir, path.basename(filename));
+    const stat = await fs.stat(filePath);
+    const ext = path.extname(filename).toLowerCase();
     const contentType = ext === '.apk'
       ? 'application/vnd.android.package-archive'
       : 'application/octet-stream';