fix(alist_v3): set child paths so nested directories resolve (#3019)

* fix(alist_v3): set child paths so nested directories resolve

- Set `Path` on every object returned by `List`, matching the OpenList
  driver. `op.Get` hands a child object straight back to `List`, so a
  child without a path made the driver request `""` from the upstream
  server, which answered with its own root: every directory below the
  mount point served the same listing back, endlessly.
- Add tests covering the child paths and a three-level descent.

Co-authored-by: Claude <81847+claude@users.noreply.github.com>

* test(alist_v3): trim the child-path test to a single case

Collapse the two tests into one two-level descent, drop the recorder
type and the helper funcs, and inline the driver setup. 173 -> 65 lines.

Co-authored-by: Claude <81847+claude@users.noreply.github.com>

---------

Co-authored-by: Fighting <3899648+Elity@users.noreply.github.com>
Co-authored-by: Claude <81847+claude@users.noreply.github.com>

drivers/alist_v3/driver.go

@@ -95,6 +95,7 @@ func (d *AListV3) List(ctx context.Context, dir model.Obj, args model.ListArgs)
 		file := model.ObjThumb{
 			Object: model.Object{
 				Name:     f.Name,
+				Path:     path.Join(dir.GetPath(), f.Name),
 				Modified: f.Modified,
 				Ctime:    f.Created,
 				Size:     f.Size,

drivers/alist_v3/driver_test.go

@@ -0,0 +1,65 @@
+package alist_v3
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/OpenListTeam/OpenList/v4/drivers/base"
+	"github.com/OpenListTeam/OpenList/v4/internal/driver"
+	"github.com/OpenListTeam/OpenList/v4/internal/model"
+	"github.com/go-resty/resty/v2"
+)
+
+// TestListSetsChildPaths descends two levels the way op.Get does, feeding an
+// object from one listing back into List as dir. Without a Path on that object
+// the driver asks upstream for "", which a real server answers with its own
+// root -- hence the fake upstream's fallback, and the endless self-similar tree.
+func TestListSetsChildPaths(t *testing.T) {
+	tree := map[string][]ObjResp{
+		"/":               {{Name: "root-marker", IsDir: true}},
+		"/drive":          {{Name: "concerts", IsDir: true}},
+		"/drive/concerts": {{Name: "show.mkv"}},
+	}
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		var req ListReq
+		_ = json.NewDecoder(r.Body).Decode(&req)
+		content, ok := tree[req.Path]
+		if !ok {
+			content = tree["/"]
+		}
+		w.Header().Set("Content-Type", "application/json") // resty only unmarshals JSON
+		_ = json.NewEncoder(w).Encode(map[string]any{
+			"code": 200, "message": "success",
+			"data": map[string]any{"content": content, "total": len(content)},
+		})
+	}))
+	t.Cleanup(srv.Close)
+
+	// conf.Conf is nil outside a booted server, so base.InitClient() is unusable.
+	prev := base.RestyClient
+	base.RestyClient = resty.New().SetTimeout(5 * time.Second)
+	t.Cleanup(func() { base.RestyClient = prev })
+
+	d := &AListV3{Addition: Addition{
+		RootPath: driver.RootPath{RootFolderPath: "/drive"},
+		Address:  srv.URL,
+	}}
+	dir := model.Obj(&model.Object{Path: "/drive", IsFolder: true})
+	for _, want := range []string{"/drive/concerts", "/drive/concerts/show.mkv"} {
+		objs, err := d.List(context.Background(), dir, model.ListArgs{})
+		if err != nil {
+			t.Fatalf("List(%q): %v", dir.GetPath(), err)
+		}
+		if len(objs) != 1 {
+			t.Fatalf("List(%q) returned %d objects, want 1", dir.GetPath(), len(objs))
+		}
+		if got := objs[0].GetPath(); got != want {
+			t.Fatalf("child of %q has path %q, want %q", dir.GetPath(), got, want)
+		}
+		dir = objs[0]
+	}
+}