Migrate from store-based fetch to React Query (useQuery) for data fetching

[Copilot]

This PR migrates the application from using Zustand stores with custom fetch methods to React Query's useQuery hooks for better data fetching and caching.

Changes Made

🔄 Data Fetching Migration

• Replaced store-based fetching: Removed useHomeStore and usePeerStore with their fetch methods
• Added React Query: Integrated @tanstack/react-query with proper configuration
• Updated views: Home and Peers views now use useQuery hooks with automatic background refetching

📁 Code Organization

• Moved API types: Created src/types/ directory and moved all API response interfaces from src/store/types.ts
• Created API services: Added src/store/api/bitcoinApi.ts with typed service functions for bitcoin endpoints
• Simplified refresh logic: Replaced complex useRefreshStore with simpler useRefreshTimeStore that only manages intervals

🧹 Cleanup

• Removed unused code:
  • src/hooks/useRefreshData.ts
  • src/store/refreshStore.ts
  • src/store/homeStore.ts
  • src/store/peerStore.ts
  • src/store/types.ts
• Updated components: RefreshTimer now uses React Query's invalidateQueries() for manual refresh

✨ Benefits

• Better UX: React Query provides built-in loading states, error handling, and background updates
• Reduced complexity: Eliminated unnecessary store boilerplate and custom refresh logic
• Type safety: Maintained strong typing with centralized API response types
• Performance: React Query's intelligent caching reduces redundant network requests

Before/After Comparison

Before: Store-based with manual refresh handling

const homeStore = useHomeStore();
useRefreshData([homeStore]);
// Data: homeStore.main.totalConnections
// Loading: homeStore.loading

After: React Query with automatic refresh

const { data: homeData, isLoading } = useQuery({
  queryKey: ['bitcoin', 'home'],
  queryFn: bitcoinApi.home,
  refetchInterval: refreshTimeStore.refreshTime > 0 ? refreshTimeStore.refreshTime : false,
});
// Data: homeData?.main.totalConnections ?? 0
// Loading: isLoading

All functionality is preserved while providing a cleaner, more maintainable architecture.

Fixes #6.

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