perf: extract fs func and add error log

internal/fs/link.go

@@ -0,0 +1,16 @@
+package fs
+
+import (
+	"context"
+	"github.com/alist-org/alist/v3/internal/model"
+	"github.com/alist-org/alist/v3/internal/operations"
+	"github.com/pkg/errors"
+)
+
+func link(ctx context.Context, path string, args model.LinkArgs) (*model.Link, error) {
+	account, actualPath, err := operations.GetAccountAndActualPath(path)
+	if err != nil {
+		return nil, errors.WithMessage(err, "failed get account")
+	}
+	return operations.Link(ctx, account, actualPath, args)
+}