feat: Add Storage Explorer with CLI terminal, alias management, and file browser

- Add CLI terminal for executing mc commands from the web interface
  - Command history with up/down arrow navigation
  - Dark theme with monospace font
  - Auto-scroll output and loading states

- Add alias management page
  - List all MinIO aliases with connection status
  - Add, edit, delete aliases
  - Test connection functionality

- Add file browser for navigating bucket contents
  - Breadcrumb navigation (alias > bucket > path)
  - File/folder table with size, type, last modified
  - Upload files (drag-and-drop support)
  - Download, rename, delete operations
  - Create new folders
  - Multi-select for batch delete

Backend:
- New API routes: /api/terminal, /api/aliases, /api/browser
- Multer middleware for file uploads
- Extended minio.service.js with file operations

Frontend:
- New Explorer component with Aliases/Terminal tabs
- Zustand stores for terminal and explorer state
- i18n translations (English and German)

backend/package.json

@@ -33,7 +33,8 @@
     "node-cron": "^3.0.3",
     "nodemailer": "^6.9.8",
     "winston": "^3.11.0",
-    "winston-daily-rotate-file": "^4.7.1"
+    "winston-daily-rotate-file": "^4.7.1",
+    "multer": "^1.4.5-lts.1"
   },
   "devDependencies": {
     "eslint": "^8.56.0",