feat: add BackupCard component and corresponding Backup model to enhance settings functionality and data management

prisma/backup-settings.json

@@ -0,0 +1,6 @@
+{
+  "enabled": true,
+  "frequency": "hourly",
+  "lastBackup": "2025-11-30T06:48:53.740Z",
+  "nextBackup": "2025-11-30T07:00:00.000Z"
+}

prisma/schema.prisma

@@ -86,3 +86,14 @@ model Category {
 
   @@index([parentId])
 }
+
+model Backup {
+  id          String   @id @default(cuid())
+  filename    String
+  filePath    String
+  size        Int      // Size in bytes
+  dataHash    String?  // Hash of the actual data (excluding Backup table)
+  createdAt   DateTime @default(now())
+
+  @@index([createdAt])
+}