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/app/api/test-sync/route.ts

@@ -0,0 +1,84 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { PackageFetcherV2 } from '@/services/packageFetcherV2'
+import { PlatformInitializer } from '@/services/platformInitializer'
+
+export async function GET() {
+  try {
+    console.log('🧪 Starting test sync...')
+    
+    // Test 1: Initialize platforms
+    await PlatformInitializer.initializePlatforms()
+    console.log('✅ Platforms initialized')
+    
+    // Test 2: Try to fetch a small sample
+    console.log('🔄 Testing Debian package fetch...')
+    
+    // Just test the fetch and parse, don't store in DB
+    const response = await fetch('https://packages.debian.org/stable/allpackages?format=txt.gz', {
+      headers: {
+        'Accept-Encoding': 'gzip, deflate',
+        'User-Agent': 'RepoHub-Package-Fetcher/1.0'
+      }
+    })
+    
+    if (!response.ok) {
+      throw new Error(`Failed to fetch: ${response.statusText}`)
+    }
+    
+    console.log('✅ Response received, size:', response.headers.get('content-length'))
+    
+    const buffer = await response.arrayBuffer()
+    console.log('✅ Buffer received, size:', buffer.byteLength)
+    
+    // Check magic bytes
+    const bytes = new Uint8Array(buffer.slice(0, 2))
+    console.log('🔍 Magic bytes:', bytes[0].toString(16), bytes[1].toString(16))
+    
+    // Try decompression
+    const { gunzip } = await import('zlib')
+    const decompressed = await new Promise<Buffer>((resolve, reject) => {
+      gunzip(new Uint8Array(buffer), (err, result) => {
+        if (err) {
+          console.error('❌ Gunzip error:', err)
+          reject(err)
+        } else {
+          console.log('✅ Gunzip successful, size:', result.length)
+          resolve(result)
+        }
+      })
+    })
+    
+    const text = decompressed.toString('utf-8')
+    console.log('✅ Text decoded, length:', text.length)
+    
+    // Parse first 10 lines
+    const lines = text.split('\n').slice(0, 20)
+    console.log('📋 First 20 lines:')
+    lines.forEach((line, i) => console.log(`${i + 1}: ${line}`))
+    
+    // Test parsing
+    const samplePackages = PackageFetcherV2['parseDebianPackageList'](text)
+    console.log('📊 Sample packages parsed:', samplePackages.length)
+    
+    if (samplePackages.length > 0) {
+      console.log('📦 First package:', samplePackages[0])
+    }
+    
+    return NextResponse.json({
+      success: true,
+      message: 'Test completed successfully',
+      bufferSize: buffer.byteLength,
+      textSize: text.length,
+      samplePackages: samplePackages.length,
+      firstPackage: samplePackages[0] || null
+    })
+    
+  } catch (error) {
+    console.error('❌ Test failed:', error)
+    return NextResponse.json({
+      success: false,
+      error: error instanceof Error ? error.message : 'Unknown error',
+      stack: error instanceof Error ? error.stack : undefined
+    }, { status: 500 })
+  }
+}