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/icons/box.svg

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" viewBox="0 0 24 24" width="24" height="24">
+  <defs>
+    <style type="text/css" id="current-color-scheme">.ColorScheme-Text { color: #fcfcfc; } </style>
+  </defs>
+  <g transform="translate(1,1)">
+    <path class="ColorScheme-Text" transform="translate(-.99999-.99999)" d="m4 4v16h16v-16h-16m1 1h14v14h-14v-14" fill="currentColor"/>
+    <path d="m3.5056345 10.977883v-7.5052069h14.878582v15.010415h-14.878582z" class="ColorScheme-Text" fill="currentColor" fill-opacity=".50196078"/>
+  </g>
+</svg>