feat: 智能体详情新增「最近对话」列表，完善推荐问题与任务深链配置

- 新增 AgentRecentChats 组件，在智能体详情面板底部按 agent_id 展示最近对话
- 调整问答/智能体侧边栏与最近对话列表展示逻辑
- 补充 dashboard-input、task-deeplink 相关配置与线程工具方法
- 后端推荐问题接口标签处理及 position_sync 微调，新增相关测试

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend-web/src/components/workspace/agents/agent-chat-sidebar.tsx

@@ -70,6 +70,8 @@ import {
 } from "@/core/threads/hooks";
 import type { AgentThread, AgentThreadState } from "@/core/threads/types";
 import {
+  bootstrapResumePath,
+  isBootstrapThread,
   isThreadFavorite,
   isThreadPinned,
   sortThreadsPinnedFirst,
@@ -338,14 +340,14 @@ function RecentChatsPane({ activeAgentId }: { activeAgentId?: string }) {
   const [renameValue, setRenameValue] = useState("");
   const [shareThreadId, setShareThreadId] = useState<string | null>(null);
 
-  // 排除调度/引导/会商类会话，与首页一致；置顶优先。
+  // 排除调度/会商类系统会话，与首页一致；智能体创建（bootstrap）会话保留展示
+  // （带机器人图标、点击回创建页）；置顶优先。
   const visibleThreads = useMemo(
     () =>
       sortThreadsPinnedFirst(
         threads.filter(
           (thread) =>
             thread.metadata?.thread_type !== "scheduler" &&
-            thread.metadata?.thread_type !== "bootstrap" &&
             thread.metadata?.thread_type !== "roundtable",
         ),
       ),
@@ -450,7 +452,8 @@ function RecentChatsPane({ activeAgentId }: { activeAgentId?: string }) {
           </div>
         ) : (
           filteredThreads.map((thread) => {
-            const href = pathOf(thread);
+            const isBoot = isBootstrapThread(thread);
+            const href = isBoot ? bootstrapResumePath(thread.thread_id) : pathOf(thread);
             const isActive = href === pathname;
             const pinned = isThreadPinned(thread);
             const favorited = isThreadFavorite(thread);
@@ -468,12 +471,22 @@ function RecentChatsPane({ activeAgentId }: { activeAgentId?: string }) {
                       : "text-muted-foreground hover:bg-accent/60 hover:text-foreground",
                   )}
                 >
-                  <MessageSquare
-                    className={cn(
-                      "size-3.5 shrink-0",
-                      isActive ? "text-primary" : "text-muted-foreground/70",
-                    )}
-                  />
+                  {isBoot ? (
+                    <Bot
+                      className={cn(
+                        "size-3.5 shrink-0",
+                        isActive ? "text-primary" : "text-muted-foreground/70",
+                      )}
+                      aria-label="智能体创建会话"
+                    />
+                  ) : (
+                    <MessageSquare
+                      className={cn(
+                        "size-3.5 shrink-0",
+                        isActive ? "text-primary" : "text-muted-foreground/70",
+                      )}
+                    />
+                  )}
                   {pinned && (
                     <Pin className="text-muted-foreground/70 size-3 shrink-0" />
                   )}