feat: DeerFlow 2.0 core capabilities — Phase 1.0 + 1.1

Phase 1.0 — Butler Mode UI:
- Hide "自动化" and "技能市场" entries from sidebar navigation
- Remove AutomationPanel and SkillMarket view rendering from App.tsx
- Simplify MainViewType to only 'chat'
- Main interface is now: chat + conversation list + detail panel only

Phase 1.1 — Mode Differentiation:
- Add subagent_enabled field to ChatModeConfig (Rust), StreamChatRequest (Tauri),
  gateway-client, kernel-client, saas-relay-client, and streamStore
- TaskTool is now only registered when subagent_enabled=true (Ultra mode)
- System prompt includes sub-agent delegation instructions only in Ultra mode
- Frontend transmits subagent_enabled from ChatMode config through the full stack

This connects the 4-tier mode selector (Flash/Thinking/Pro/Ultra) to actual
backend behavioral differences — Ultra mode now truly enables sub-agent delegation.

desktop/src/App.tsx

@@ -1,12 +1,9 @@
 import { useState, useEffect, useCallback, useRef } from 'react';
-import { motion, AnimatePresence } from 'framer-motion';
 import './index.css';
-import { Sidebar, MainViewType } from './components/Sidebar';
+import { Sidebar } from './components/Sidebar';
 import { ChatArea } from './components/ChatArea';
 import { RightPanel } from './components/RightPanel';
 import { SettingsLayout } from './components/Settings/SettingsLayout';
-import { AutomationPanel } from './components/Automation';
-import { SkillMarket } from './components/SkillMarket';
 import { AgentOnboardingWizard } from './components/AgentOnboardingWizard';
 import { HandApprovalModal } from './components/HandApprovalModal';
 import { TopBar } from './components/TopBar';
@@ -17,7 +14,7 @@ import { useHandStore, type HandRun } from './store/handStore';
 import { useChatStore } from './store/chatStore';
 import { initializeStores } from './store';
 import { getStoredGatewayToken } from './lib/gateway-client';
-import { pageVariants, defaultTransition, fadeInVariants } from './lib/animations';
+
 import { Loader2 } from 'lucide-react';
 import { isTauriRuntime, getLocalGatewayStatus, startLocalGateway } from './lib/tauri-gateway';
 import { LoginPage } from './components/LoginPage';
@@ -49,7 +46,6 @@ function BootstrapScreen({ status }: { status: string }) {
 
 function App() {
   const [view, setView] = useState<View>('main');
-  const [mainContentView, setMainContentView] = useState<MainViewType>('chat');
   const [bootstrapping, setBootstrapping] = useState(true);
   const [bootstrapStatus, setBootstrapStatus] = useState('Initializing...');
   const [showOnboarding, setShowOnboarding] = useState(false);
@@ -379,11 +375,6 @@ function App() {
     }
   };
 
-  // 处理主视图切换
-  const handleMainViewChange = (view: MainViewType) => {
-    setMainContentView(view);
-  };
-
   // 登录门禁 — 必须登录才能使用
   if (isRestoring) {
     return <BootstrapScreen status="Restoring session..." />;
@@ -457,7 +448,6 @@ function App() {
       {/* 左侧边栏 */}
       <Sidebar
         onOpenSettings={() => setView('settings')}
-        onMainViewChange={handleMainViewChange}
       />
 
       {/* 主内容区 */}
@@ -468,62 +458,8 @@ function App() {
           onOpenDetail={() => setShowDetailDrawer(true)}
         />
 
-        {/* 内容区域 */}
-        <AnimatePresence mode="wait">
-          <motion.main
-            key={mainContentView}
-            variants={pageVariants}
-            initial="initial"
-            animate="animate"
-            exit="exit"
-            transition={defaultTransition}
-            className="flex-1 overflow-hidden relative flex flex-col"
-          >
-            {mainContentView === 'automation' ? (
-              <motion.div
-                variants={fadeInVariants}
-                initial="initial"
-                animate="animate"
-                className="h-full overflow-y-auto"
-              >
-                <div className="sticky top-0 z-10 flex items-center gap-2 px-4 py-2 bg-white/80 dark:bg-gray-900/80 backdrop-blur-sm border-b border-gray-200 dark:border-gray-800">
-                  <button
-                    onClick={() => handleMainViewChange('chat')}
-                    className="p-1.5 hover:bg-black/5 dark:hover:bg-white/5 rounded-md transition-colors text-gray-600 dark:text-gray-400"
-                    title="返回聊天"
-                  >
-                    <svg xmlns="http://www.w3.org/2000/svg" className="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="m15 18-6-6 6-6"/></svg>
-                  </button>
-                  <span className="text-sm font-medium text-gray-900 dark:text-gray-100">自动化</span>
-                </div>
-                <AutomationPanel />
-              </motion.div>
-            ) : mainContentView === 'skills' ? (
-              <motion.div
-                variants={fadeInVariants}
-                initial="initial"
-                animate="animate"
-                className="h-full overflow-hidden"
-              >
-                <div className="flex items-center gap-2 px-4 py-2 border-b border-gray-200 dark:border-gray-800">
-                  <button
-                    onClick={() => handleMainViewChange('chat')}
-                    className="p-1.5 hover:bg-black/5 dark:hover:bg-white/5 rounded-md transition-colors text-gray-600 dark:text-gray-400"
-                    title="返回聊天"
-                  >
-                    <svg xmlns="http://www.w3.org/2000/svg" className="w-4 h-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="m15 18-6-6 6-6"/></svg>
-                  </button>
-                  <span className="text-sm font-medium text-gray-900 dark:text-gray-100">技能市场</span>
-                </div>
-                <div className="h-[calc(100%-40px)] overflow-auto">
-                  <SkillMarket />
-                </div>
-              </motion.div>
-            ) : (
-              <ChatArea />
-            )}
-          </motion.main>
-        </AnimatePresence>
+        {/* 聊天区域 */}
+        <ChatArea />
       </div>
 
       {/* 详情抽屉 - 按需显示 */}