feat: image upload & preview untuk bug reports via MinIO

- Upload hingga 3 gambar per bug report (FileInput multi-select)
- Backend: POST /api/upload/image → MinIO, GET /api/bugs/images → presigned URL redirect
- Auto-create bucket jika belum ada saat server start
- Preview gambar fullscreen saat thumbnail diklik
- Diterapkan di /bug-reports dan /apps/$appId/errors
- Migrasi storage dari Seafile ke MinIO (minio SDK v8)

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

package.json

@@ -34,6 +34,7 @@
     "@tanstack/react-query": "^5.95.2",
     "@tanstack/react-router": "^1.168.10",
     "elysia": "^1.4.28",
+    "minio": "^8.0.7",
     "postcss": "^8.5.8",
     "postcss-preset-mantine": "^1.18.0",
     "postcss-simple-vars": "^7.0.1",