feat: add direct links download functionality

- Implemented a new task type for handling direct links downloads.
- Added command handler for downloading multiple links via /dl command.
- Introduced progress tracking for direct link downloads.
- Enhanced filename parsing to support various encoding scenarios.
- Updated enums to include direct links as a task type.
- Refactored existing task structures to accommodate new functionality.
- Improved error handling and logging throughout the download process.

core/tasks/batchtfile/execute.go

@@ -24,7 +24,7 @@ func (t *Task) Execute(ctx context.Context) error {
 	workers := config.C().Workers
 	eg, gctx := errgroup.WithContext(ctx)
 	eg.SetLimit(workers)
-	for _, elem := range t.Elems {
+	for _, elem := range t.elems {
 		eg.Go(func() error {
 			t.processingMu.RLock()
 			if t.processing[elem.ID] != nil {

core/tasks/batchtfile/task.go

@@ -25,8 +25,8 @@ type TaskElement struct {
 
 type Task struct {
 	ID           string
-	Ctx          context.Context
-	Elems        []TaskElement
+	ctx          context.Context
+	elems        []TaskElement
 	Progress     ProgressTracker
 	IgnoreErrors bool // if true, errors during processing will be ignored
 	downloaded   atomic.Int64
@@ -78,8 +78,8 @@ func NewBatchTGFileTask(
 ) *Task {
 	task := &Task{
 		ID:         id,
-		Ctx:        ctx,
-		Elems:      files,
+		ctx:        ctx,
+		elems:      files,
 		Progress:   progress,
 		downloaded: atomic.Int64{},
 		totalSize: func() int64 {

core/tasks/batchtfile/taskinfo.go

@@ -44,11 +44,11 @@ func (t *Task) Downloaded() int64 {
 }
 
 func (t *Task) Count() int {
-	return len(t.Elems)
+	return len(t.elems)
 }
 
 func (t *Task) Processing() []TaskElementInfo {
-	processing := make([]TaskElementInfo, 0, len(t.Elems))
+	processing := make([]TaskElementInfo, 0, len(t.elems))
 	for _, elem := range t.processing {
 		processing = append(processing, elem)
 	}