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-tauri/src/intelligence/identity.rs

@@ -284,18 +284,23 @@ impl AgentIdentityManager {
         if !identity.instructions.is_empty() {
             sections.push(identity.instructions.clone());
         }
-        // NOTE: user_profile injection is intentionally disabled.
-        // The reflection engine may accumulate overly specific details from past
-        // conversations (e.g., "广东光华", "汕头玩具产业") into user_profile.
-        // These details then leak into every new conversation's system prompt,
-        // causing the model to think about old topics instead of the current query.
-        // Memory injection should only happen via MemoryMiddleware with relevance
-        // filtering, not unconditionally via user_profile.
-        // if !identity.user_profile.is_empty()
-        //     && identity.user_profile != default_user_profile()
-        // {
-        //     sections.push(format!("## 用户画像\n{}", identity.user_profile));
-        // }
+        // Inject user_profile into system prompt for cross-session identity continuity.
+        // Truncate to first 10 lines to avoid flooding the prompt with overly specific
+        // details accumulated by the reflection engine. Core identity (name, role)
+        // is typically in the first few lines.
+        if !identity.user_profile.is_empty()
+            && identity.user_profile != default_user_profile()
+        {
+            let truncated: String = identity
+                .user_profile
+                .lines()
+                .take(10)
+                .collect::<Vec<_>>()
+                .join("\n");
+            if !truncated.is_empty() {
+                sections.push(format!("## 用户画像\n{}", truncated));
+            }
+        }
         if let Some(ctx) = memory_context {
             sections.push(ctx.to_string());
         }