feat(orbit): add shared library foundations and gated host tools

Extract the HTTP host and catalog layer into qbz-control, preserve the
existing daemon API, and keep private session credentials out of SSE.

Scope library stores and scan workers to their host. Share bounded source
search and show Local results alongside Qobuz in the Qt search page.

Add the launch-gated Qt Orbit laboratory and persistent remote-context
banner. Let qbzd run --orbit own and administer its file library through
instance-scoped API and CLI operations. Full remote UI control remains
pending.

Validate library/control/daemon suites, Qt search and QML regressions,
two isolated daemon processes, Qt release build and final cargo check.

cx

crates/qbz-qt/qml/views/SearchView.qml

@@ -76,6 +76,7 @@ Rectangle {
     readonly property var artists: doc.artists || []
     readonly property var artistsCarousel: doc.artistsCarousel || []
     readonly property var playlists: doc.playlists || []
+    readonly property var localSections: doc.localSections || []
     readonly property var mp: doc.mostPopular || ({})
     readonly property bool loading: doc.loading === true
     readonly property int tab: doc.tab || 0
@@ -84,7 +85,8 @@ Rectangle {
     // IDENTITY: when it changes, the page on screen is a different result set
     // and any pending "fade the tail" threshold is stale (see clearFade).
     readonly property string query: doc.query || ""
-    readonly property bool hasResults: albums.length + tracks.length + artists.length + playlists.length > 0
+    readonly property bool hasQobuzResults: albums.length + tracks.length + artists.length + playlists.length > 0
+    readonly property bool hasResults: hasQobuzResults || localSections.length > 0
     readonly property int previewCap: 6
 
     // The per-type result tabs live inside the page Flickable, so a GridView
@@ -665,11 +667,17 @@ Rectangle {
                 font.weight: theme.weightBold
             }
             Row {
-                visible: root.hasResults
+                visible: root.hasQobuzResults || root.filterIndex !== 0
                 anchors.right: parent.right
                 anchors.rightMargin: 32
                 anchors.verticalCenter: parent.verticalCenter
                 spacing: 16
+                Text {
+                    text: QbzSession.tr("Qobuz", QbzSession.trRev)
+                    color: theme.textMuted
+                    font.pixelSize: 12
+                    anchors.verticalCenter: parent.verticalCenter
+                }
                 FilterRadio { label: QbzSession.tr("Main Artist", QbzSession.trRev); selected: root.filterIndex === 1; onPicked: QbzSearch.searchFilterChanged(1) }
                 FilterRadio { label: QbzSession.tr("Performer", QbzSession.trRev); selected: root.filterIndex === 2; onPicked: QbzSearch.searchFilterChanged(2) }
                 FilterRadio { label: QbzSession.tr("Composer", QbzSession.trRev); selected: root.filterIndex === 3; onPicked: QbzSearch.searchFilterChanged(3) }
@@ -1213,6 +1221,20 @@ Rectangle {
                         cellH: 270
                         onClicked: root.armLoadMore(4)
                     }
+                    SearchLocalResults {
+                        id: localSearchResults
+                        width: parent.width
+                        sections: root.localSections
+                        revision: root.doc.localRevision || ""
+                        tab: root.tab
+                        visible: localSearchResults.hasResults
+                        onActivated: function(revision, index, action) {
+                            QbzSearch.searchLocalAction(revision, index, action)
+                        }
+                        onViewMore: function(revision, kind) {
+                            QbzSearch.searchLocalMore(revision, kind)
+                        }
+                    }
                 }
 
                 // ---- Loading skeleton ---------------------------------------