feat: add multiple package sync sources and API integration

- Added undici dependency and implemented three package fetcher variants (simple text parsing, v2 with better error handling, and official repository sync)
- Integrated real API calls in PlatformSelector and PackageBrowser components with fallback to mock data
- Extended sync API route to support multiple data sources (debian-simple, ubuntu-simple, debian-official-v2, etc.) with platform initialization

src/components/SelectionManager.tsx

@@ -73,11 +73,9 @@ export function SelectionManager({
                   {pkg.description}
                 </p>
                 <div className="flex items-center space-x-2 text-xs text-muted-foreground mt-1">
-                  <span>{pkg.platform}</span>
+                  <span>{pkg.type?.toUpperCase() || 'CLI'}</span>
                   <span>•</span>
-                  <span>{pkg.category}</span>
-                  <span>•</span>
-                  <span>{pkg.license}</span>
+                  <span>{pkg.repository || 'official'}</span>
                 </div>
               </div>
               <Button