feat: enable S2S with native Viking memory

internal/vikingmemory/service.go

@@ -27,6 +27,15 @@ type Service struct {
 	client *Client
 }
 
+// NativeAccess contains only non-secret values that Volcano needs to query
+// this user's memory. The Viking API key is never returned to the device.
+type NativeAccess struct {
+	SubjectID, UserID, CollectionName, AssistantID string
+	MemoryTypes                                    []string
+	Limit                                          int
+	TransitionWords                                string
+}
+
 func NewService(pool *pgxpool.Pool, client *Client) *Service {
 	return &Service{pool: pool, client: client}
 }
@@ -71,6 +80,33 @@ func (s *Service) PrepareForDevice(ctx context.Context, tenant, device string) (
 	}
 	return subject, strings.Join(parts, "\n"), nil
 }
+
+func (s *Service) NativeAccessForDevice(ctx context.Context, tenant, device string) (*NativeAccess, error) {
+	if strings.TrimSpace(s.client.options.CollectionName) == "" {
+		return nil, nil
+	}
+	var subject string
+	err := s.pool.QueryRow(ctx, `SELECT b.subject_id::text FROM device_binding b JOIN device d ON d.id=b.device_id AND d.tenant_id=b.tenant_id WHERE b.device_id=$1::uuid AND b.tenant_id=$2::uuid AND b.unbound_at IS NULL AND d.status='registered'`, device, tenant).Scan(&subject)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	ok, err := s.Eligible(ctx, tenant, subject)
+	if err != nil || !ok {
+		return nil, err
+	}
+	memoryTypes := []string{s.client.options.EventType}
+	if s.client.options.ProfileType != "" && s.client.options.ProfileType != s.client.options.EventType {
+		memoryTypes = append(memoryTypes, s.client.options.ProfileType)
+	}
+	return &NativeAccess{
+		SubjectID: subject, UserID: UserID(tenant, subject), CollectionName: s.client.options.CollectionName,
+		AssistantID: AssistantID, MemoryTypes: memoryTypes, Limit: 5,
+		TransitionWords: "可参考的用户历史记忆如下，请自然承接；若与用户最新说法冲突，以最新说法为准：",
+	}, nil
+}
 func (s *Service) Enqueue(ctx context.Context, event outbox.Event) error {
 	tx, err := s.pool.Begin(ctx)
 	if err != nil {