Stemify iOS 1.1 and WebUI updates, repo restructure into desktop/ios/server/web

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

desktop/stemify/qml/Stemify/LevelMeter.qml

@@ -0,0 +1,73 @@
+import QtQuick
+
+// Stereo peak meter fed per frame from the audio ring buffer (via Main).
+Item {
+    id: m
+    property real levelLeft: 0
+    property real levelRight: 0
+    property real holdL: 0
+    property real holdR: 0
+    implicitWidth: 150
+    implicitHeight: 22
+
+    function frac(v) {
+        if (v <= 0.000001) return 0
+        var db = 20 * Math.log(v) / Math.LN10
+        return Math.max(0, Math.min(1, (db + 54) / 54))
+    }
+    onLevelLeftChanged: holdL = Math.max(holdL, frac(levelLeft))
+    onLevelRightChanged: holdR = Math.max(holdR, frac(levelRight))
+    FrameAnimation {
+        running: m.holdL > 0.001 || m.holdR > 0.001
+        onTriggered: {
+            var d = frameTime * 0.35
+            m.holdL = Math.max(m.frac(m.levelLeft), m.holdL - d)
+            m.holdR = Math.max(m.frac(m.levelRight), m.holdR - d)
+        }
+    }
+
+    Column {
+        anchors.fill: parent
+        spacing: 4
+        Repeater {
+            model: 2
+            Item {
+                required property int index
+                readonly property real level: m.frac(index === 0 ? m.levelLeft : m.levelRight)
+                readonly property real hold: index === 0 ? m.holdL : m.holdR
+                width: m.width
+                height: (m.height - 4) / 2
+                Rectangle {
+                    anchors.fill: parent
+                    radius: 2
+                    color: Qt.rgba(1, 1, 1, 0.07)
+                }
+                Item {
+                    width: parent.width * parent.level
+                    height: parent.height
+                    clip: true
+                    Rectangle {
+                        width: m.width
+                        height: parent.height
+                        radius: 2
+                        gradient: Gradient {
+                            orientation: Gradient.Horizontal
+                            GradientStop { position: 0.0; color: Theme.success }
+                            GradientStop { position: 0.72; color: Theme.accentGlow }
+                            GradientStop { position: 0.88; color: Theme.warning }
+                            GradientStop { position: 1.0; color: Theme.error }
+                        }
+                    }
+                }
+                Rectangle {
+                    visible: parent.hold > 0.01
+                    x: Math.min(parent.width - 2, parent.width * parent.hold)
+                    width: 2
+                    height: parent.height
+                    color: parent.hold > 0.95 ? Theme.error : Theme.textHi
+                    opacity: 0.85
+                }
+            }
+        }
+    }
+}