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/store/agentStore.ts

@@ -204,7 +204,28 @@ export const useAgentStore = create<AgentStore>((set, get) => ({
     set({ isLoading: true, error: null });
     try {
       // Step 1: Call backend to get server-processed config (tools merge)
-      const config = await saasClient.createAgentFromTemplate(template.id);
+      // Fallback to template data directly if SaaS is unreachable
+      let config;
+      try {
+        config = await saasClient.createAgentFromTemplate(template.id);
+      } catch (saasErr) {
+        log.warn('[AgentStore] SaaS createAgentFromTemplate failed, using template directly:', saasErr);
+        // Fallback: build config from template data without server-side tools merge
+        config = {
+          name: template.name,
+          model: template.model,
+          system_prompt: template.system_prompt,
+          tools: template.tools || [],
+          soul_content: template.soul_content,
+          welcome_message: template.welcome_message,
+          quick_commands: template.quick_commands,
+          temperature: template.temperature,
+          max_tokens: template.max_tokens,
+          personality: template.personality,
+          communication_style: template.communication_style,
+          emoji: template.emoji,
+        };
+      }
 
       // Resolve model: template model > first available SaaS model > 'default'
       const resolvedModel = config.model