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

fix-ubuntu-name.sql

@@ -0,0 +1,7 @@
+-- Fix Ubuntu platform name
+UPDATE platforms 
+SET name = 'Ubuntu' 
+WHERE id = 'ubuntu' AND name = 'Ubuntu/Debian';
+
+-- Verify the change
+SELECT id, name, package_manager FROM platforms WHERE id IN ('ubuntu', 'debian');