fix(agent): 12 项 agent 对话链路全栈修复

深端到端验证发现 12 个问题，6 Phase 全栈修复：

Phase 5 — 快速 UX 修复:
- #9: SimpleSidebar 添加新对话按钮 (SquarePen + useChatStore)
- #5: 模型列表 JOIN provider_keys 过滤无 API Key 的模型
- #11: AgentOnboardingWizard 焦点领域增加 4 行业选项
  (医疗健康/教育培训/金融财务/法律合规)

Phase 1 — ButlerPanel 记忆修复:
- #2a: MemorySection URI 从 viking://agent/.../memories/ 修正为 agent://.../
- #2b: "立即分析对话"按钮现在触发 extractAndStoreMemories

Phase 2 — FTS5 中文分词:
- #4: FTS5 tokenizer 从 unicode61 切换到 trigram，原生支持 CJK
- 自动迁移：检测旧 unicode61 表并重建索引
- sanitize_fts_query 支持中文引号短语查询

Phase 3 — 跨会话身份持久化:
- #6-8: 重新启用 USER.md 注入系统提示词 (截断前 10 行)

Phase 4 — Agent 面板同步:
- #1,#10: listClones 从 4 字段扩展到完整映射
  (soul/userProfile 解析 nickname/emoji/userName/userRole)
- updateClone 通过 identity 系统同步 nickname→SOUL.md
  和 userName/userRole→USER.md

Phase 6 — Agent 创建容错:
- #12: createFromTemplate 增加 SaaS 不可用 fallback

验证: tsc --noEmit ✅ cargo check ✅

desktop/src/components/SimpleSidebar.tsx

@@ -7,10 +7,11 @@
 
 import { useState } from 'react';
 import {
-  Settings, LayoutGrid,
+  Settings, LayoutGrid, SquarePen,
   Search, X,
 } from 'lucide-react';
 import { ConversationList } from './ConversationList';
+import { useChatStore } from '../store/chatStore';
 
 interface SimpleSidebarProps {
   onOpenSettings?: () => void;
@@ -19,6 +20,11 @@ interface SimpleSidebarProps {
 
 export function SimpleSidebar({ onOpenSettings, onToggleMode }: SimpleSidebarProps) {
   const [searchQuery, setSearchQuery] = useState('');
+  const newConversation = useChatStore((s) => s.newConversation);
+
+  const handleNewConversation = () => {
+    newConversation();
+  };
 
   return (
     <aside className="w-64 sidebar-bg border-r border-[#e8e6e1] dark:border-gray-800 flex flex-col h-full shrink-0">
@@ -27,11 +33,26 @@ export function SimpleSidebar({ onOpenSettings, onToggleMode }: SimpleSidebarPro
         <span className="text-lg font-semibold tracking-tight bg-gradient-to-r from-orange-500 to-amber-500 bg-clip-text text-transparent">
           ZCLAW
         </span>
+        <button
+          onClick={handleNewConversation}
+          className="ml-auto p-1.5 hover:bg-black/5 dark:hover:bg-white/5 rounded-md transition-colors text-gray-600 dark:text-gray-400"
+          title="新对话"
+        >
+          <SquarePen className="w-4 h-4" />
+        </button>
       </div>
 
       {/* 内容区域 */}
       <div className="flex-1 overflow-hidden">
         <div className="p-2 h-full overflow-y-auto">
+          {/* 新对话按钮 */}
+          <button
+            onClick={handleNewConversation}
+            className="w-full flex items-center gap-3 px-3 py-2 rounded-lg bg-black/5 dark:bg-white/5 text-sm font-medium text-gray-900 dark:text-gray-100 hover:bg-black/10 dark:hover:bg-white/10 transition-colors mb-2"
+          >
+            <SquarePen className="w-4 h-4" />
+            新对话
+          </button>
           {/* 搜索框 */}
           <div className="relative mb-2">
             <Search className="absolute left-3 top-1/2 -translate-y-1/2 text-gray-400 w-4 h-4" />