feat: add ImportCrowdSec page and integrate with backup functionality; refactor navigation structure

frontend/src/pages/ImportCrowdSec.tsx

@@ -0,0 +1,62 @@
+import { useState } from 'react'
+import { useMutation } from '@tanstack/react-query'
+import { importCrowdsecConfig } from '../api/crowdsec'
+import { createBackup } from '../api/backups'
+import { Button } from '../components/ui/Button'
+import { Card } from '../components/ui/Card'
+import { toast } from 'react-hot-toast'
+
+export default function ImportCrowdSec() {
+  const [file, setFile] = useState<File | null>(null)
+
+  const backupMutation = useMutation({
+    mutationFn: () => createBackup(),
+  })
+
+  const importMutation = useMutation({
+    mutationFn: async (file: File) => importCrowdsecConfig(file),
+    onSuccess: () => {
+      toast.success('CrowdSec config imported')
+    },
+    onError: (e: unknown) => {
+      const msg = e instanceof Error ? e.message : String(e)
+      toast.error(`Import failed: ${msg}`)
+    }
+  })
+
+  const handleFile = (e: React.ChangeEvent<HTMLInputElement>) => {
+    const f = e.target.files?.[0]
+    if (!f) return
+    setFile(f)
+  }
+
+  const handleImport = async () => {
+    if (!file) return
+    try {
+      toast.loading('Creating backup...')
+      await backupMutation.mutateAsync()
+      toast.dismiss()
+      toast.loading('Importing CrowdSec...')
+      await importMutation.mutateAsync(file)
+      toast.dismiss()
+    } catch {
+      toast.dismiss()
+      // importMutation onError handles toast
+    }
+  }
+
+  return (
+    <div className="p-8">
+      <h1 className="text-3xl font-bold text-white mb-6">Import CrowdSec</h1>
+      <Card className="p-6">
+        <div className="space-y-4">
+          <p className="text-sm text-gray-400">Upload a tar.gz or zip with your CrowdSec configuration. A backup will be created before importing.</p>
+          <input type="file" onChange={handleFile} accept=".tar.gz,.zip" />
+          <div className="flex gap-2">
+            <Button onClick={() => handleImport()} isLoading={backupMutation.isPending || importMutation.isPending} disabled={!file}>Import</Button>
+          </div>
+        </div>
+      </Card>
+    </div>
+  )
+}