refactor: rewrite project from Rust to Go

- Replace Axum with Chi router
- Replace sqlx with pgx for PostgreSQL
- Replace tonic/prost with grpc-go
- Replace tracing with zerolog
- Update flake.nix for Go build with protoc generation
- Preserve all existing endpoints and functionality

Stack: Chi, pgx, grpc-go, zerolog, yaml.v3

internal/services/torrent.go

@@ -0,0 +1,98 @@
+package services
+
+import (
+	"context"
+
+	"github.com/fujin/music-agregator/internal/config"
+	"github.com/fujin/music-agregator/internal/torrent"
+)
+
+type TorrentService struct {
+	client torrent.Client
+}
+
+func NewTorrentService(cfg config.TorrentConfig) (*TorrentService, error) {
+	var client torrent.Client
+
+	switch cfg.ClientType {
+	case config.TorrentClientQBittorrent:
+		c, err := torrent.NewQBittorrentClient(cfg.URL, cfg.Username, cfg.Password)
+		if err != nil {
+			return nil, err
+		}
+		client = c
+	case config.TorrentClientStub:
+		client = torrent.NewStubClient(cfg.LogPath, cfg.SavePath)
+	default:
+		return &TorrentService{client: nil}, nil
+	}
+
+	return &TorrentService{client: client}, nil
+}
+
+func (s *TorrentService) Connect(ctx context.Context) error {
+	if s.client == nil {
+		return nil
+	}
+	return s.client.Connect(ctx)
+}
+
+func (s *TorrentService) Disconnect(ctx context.Context) error {
+	if s.client == nil {
+		return nil
+	}
+	return s.client.Disconnect(ctx)
+}
+
+func (s *TorrentService) ListTorrents(ctx context.Context) ([]torrent.TorrentInfo, error) {
+	if s.client == nil {
+		return []torrent.TorrentInfo{}, nil
+	}
+	return s.client.ListTorrents(ctx)
+}
+
+func (s *TorrentService) GetTorrent(ctx context.Context, hash string) (*torrent.TorrentInfo, error) {
+	if s.client == nil {
+		return nil, torrent.ErrTorrentNotFound
+	}
+	return s.client.GetTorrent(ctx, hash)
+}
+
+func (s *TorrentService) AddTorrentURL(ctx context.Context, url string, savePath *string) error {
+	if s.client == nil {
+		return nil
+	}
+	return s.client.AddTorrentURL(ctx, url, savePath)
+}
+
+func (s *TorrentService) AddTorrentFile(ctx context.Context, data []byte, savePath *string) error {
+	if s.client == nil {
+		return nil
+	}
+	return s.client.AddTorrentFile(ctx, data, savePath)
+}
+
+func (s *TorrentService) RemoveTorrent(ctx context.Context, hash string, deleteFiles bool) error {
+	if s.client == nil {
+		return nil
+	}
+	return s.client.RemoveTorrent(ctx, hash, deleteFiles)
+}
+
+func (s *TorrentService) PauseTorrent(ctx context.Context, hash string) error {
+	if s.client == nil {
+		return nil
+	}
+	return s.client.PauseTorrent(ctx, hash)
+}
+
+func (s *TorrentService) ResumeTorrent(ctx context.Context, hash string) error {
+	if s.client == nil {
+		return nil
+	}
+	return s.client.ResumeTorrent(ctx, hash)
+}
+
+func (s *TorrentService) IsConfigured() bool {
+	return s.client != nil
+}