perf(link): optimize concurrent response (#641)

* fix(crypt): bug caused by link cache

* perf(crypt,mega,halalcloud,quark,uc): optimize concurrent response link

* chore: 删除无用代码

* ftp

* 修复bug；资源释放

* 添加SyncClosers

* local,sftp,smb

* 重构，优化，增强

* Update internal/stream/util.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: j2rong4cn <36783515+j2rong4cn@users.noreply.github.com>

* chore

* chore

* 优化，修复bug

* .

---------

Signed-off-by: j2rong4cn <36783515+j2rong4cn@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

pkg/singleflight/singleflight.go

@@ -73,6 +73,8 @@ type call[T any] struct {
 type Group[T any] struct {
 	mu sync.Mutex          // protects m
 	m  map[string]*call[T] // lazily initialized
+
+	Remember bool
 }
 
 // Result holds the results of Do, so they can be passed
@@ -156,7 +158,7 @@ func (g *Group[T]) doCall(c *call[T], key string, fn func() (T, error)) {
 		g.mu.Lock()
 		defer g.mu.Unlock()
 		c.wg.Done()
-		if g.m[key] == c {
+		if !g.Remember && g.m[key] == c {
 			delete(g.m, key)
 		}