feat: Hermit 1.1.0 — HERMIT_* env, Tauri desktop shell

Wire hermit_getenv across the engine, rebrand WebUI/systemd/docs, and
add apps/desktop (Tauri 2 + React) with a DeepSeek-Harness-like UI.
Qt app/ is frozen; full libcstcore FFI is scaffolded behind --features engine.

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

web/index.html

@@ -4,7 +4,7 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
 <meta name="color-scheme" content="dark light">
-<title>CST-Agent</title>
+<title>Hermit</title>
 <link rel="stylesheet" href="style.css">
 </head>
 <body>
@@ -56,7 +56,7 @@
    <div class="side-inner">
     <div class="side-head">
       <div class="brand">
-        <span class="brand-name">CST-Agent</span>
+        <span class="brand-name">Hermit</span>
       </div>
       <button id="btn-collapse" class="icon" title="收起侧栏 (Ctrl+B)">
         <svg class="i"><use href="#i-panel-left"/></svg>
@@ -158,7 +158,7 @@
 
       <div id="slash" class="slash" role="listbox" hidden></div>
       <div class="box">
-        <textarea id="input" rows="1" placeholder="给 CST-Agent 派个任务…（/ 打开命令，F1 看快捷键）"></textarea>
+        <textarea id="input" rows="1" placeholder="给 Hermit 派个任务…（/ 打开命令，F1 看快捷键）"></textarea>
         <div class="box-row">
           <button id="btn-plus" class="icon att" title="添加图片或计划模式">
             <svg class="i"><use href="#i-plus"/></svg>