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>

src/lib/minio.ts

@@ -0,0 +1,36 @@
+import { Client } from 'minio'
+import { env } from './env'
+
+const client = new Client({
+  endPoint: env.MINIO_ENDPOINT,
+  port: env.MINIO_PORT,
+  useSSL: env.MINIO_USE_SSL,
+  accessKey: env.MINIO_ACCESS_KEY,
+  secretKey: env.MINIO_SECRET_KEY,
+})
+
+// Auto-create bucket if it doesn't exist
+client.bucketExists(env.MINIO_BUCKET).then(async (exists) => {
+  if (!exists) {
+    await client.makeBucket(env.MINIO_BUCKET)
+    console.log(`[MinIO] Bucket "${env.MINIO_BUCKET}" created.`)
+  }
+}).catch((err) => {
+  console.error('[MinIO] Failed to check/create bucket:', err.message)
+})
+
+export async function uploadBugImage(file: File): Promise<string> {
+  const ext = file.name.split('.').pop()?.toLowerCase() ?? 'bin'
+  const objectName = `${env.MINIO_UPLOAD_DIR}/${crypto.randomUUID()}.${ext}`
+  const buffer = Buffer.from(await file.arrayBuffer())
+
+  await client.putObject(env.MINIO_BUCKET, objectName, buffer, file.size, {
+    'Content-Type': file.type,
+  })
+
+  return objectName // e.g. bug-reports/uuid.jpg
+}
+
+export async function getMinioDownloadUrl(objectName: string): Promise<string> {
+  return client.presignedGetObject(env.MINIO_BUCKET, objectName, 3600)
+}