refactor: archive GUI clients; keep minimal TUI with hooks/API

Move Qt/Tauri/full Web SPA under archive/, ship hermit as CLI/TUI plus
libcstcore and cst-webui/1 HTTP+SSE (turn lifecycle hooks, capabilities).

Co-authored-by: Cursor <cursoragent@cursor.com>

archive/qt-app/android/res/drawable/ic_launcher.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Launcher icon: the terminal prompt the app is about ("&gt;_"), the window's
+     own colors (bg #12161a, accent #5cc0f0, faint #8d959c). A vector drawable
+     works from API 24 up; a proper adaptive icon (mipmap-anydpi-v26 + a PNG
+     fallback) is polish for later. -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+
+    <path
+        android:fillColor="#12161a"
+        android:pathData="M0,0h108v108h-108z" />
+
+    <path
+        android:fillColor="#00000000"
+        android:strokeColor="#5cc0f0"
+        android:strokeWidth="7"
+        android:strokeLineCap="round"
+        android:strokeLineJoin="round"
+        android:pathData="M32,38 L52,54 L32,70" />
+
+    <path
+        android:fillColor="#00000000"
+        android:strokeColor="#8d959c"
+        android:strokeWidth="7"
+        android:strokeLineCap="round"
+        android:pathData="M58,74 L78,74" />
+</vector>

archive/qt-app/android/res/values/strings.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- The name under the launcher icon. -->
+<resources>
+    <string name="app_name">CST-agent</string>
+</resources>