perf(123pan): optimize rate limiting (#6859)

- eliminating fixed 200 ms delay in getFiles to prevent thread starvation
- allowing cancellation via context to mitigate potential DoS attacks by immediately cancelling excessive requests

drivers/123_share/util.go

@@ -1,6 +1,7 @@
 package _123Share
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"hash/crc32"
@@ -80,13 +81,12 @@ func (d *Pan123Share) request(url string, method string, callback base.ReqCallba
 	return body, nil
 }
 
-func (d *Pan123Share) getFiles(parentId string) ([]File, error) {
+func (d *Pan123Share) getFiles(ctx context.Context, parentId string) ([]File, error) {
 	page := 1
 	res := make([]File, 0)
 	for {
-		if !d.APIRateLimit(FileList) {
-			time.Sleep(time.Millisecond * 200)
-			continue
+		if err := d.APIRateLimit(ctx, FileList); err != nil {
+			return nil, err
 		}
 		var resp Files
 		query := map[string]string{