feat: complete security overhaul with JWT backend and authenticated frontend API

frontend/migrate_fetch.ps1

@@ -0,0 +1,17 @@
+$compDir = "src\components"
+$files = Get-ChildItem -Path $compDir -Filter "*.tsx"
+
+foreach ($file in $files) {
+    $path = $file.FullName
+    $content = [System.IO.File]::ReadAllText($path, [System.Text.Encoding]::UTF8)
+
+    if ($content.Contains("await fetch(")) {
+        if (-not $content.Contains("from '../api'")) {
+            $content = "import { apiFetch } from '../api';" + [System.Environment]::NewLine + $content
+        }
+        $content = $content.Replace("await fetch(", "await apiFetch(")
+        [System.IO.File]::WriteAllText($path, $content, [System.Text.Encoding]::UTF8)
+        Write-Host "Updated component: $($file.Name)"
+    }
+}
+Write-Host "Components migration complete."