feat: Agent 任务名与对话标题双能力自动生成

新增 task_auto_title_enabled / chat_auto_title_enabled（默认关）、
共享 GenerateAutoTitle、spawn_task 同步写 name、对话首条先截断再异步 AI，
设置页「自动标题」双 Switch。closes #55

web/src/app/(main)/system/settings/page.tsx

@@ -24,6 +24,8 @@ export default function SystemSettingsPage() {
   const [credentialBinding, setCredentialBinding] = React.useState(false);
   const [savingCredentials, setSavingCredentials] = React.useState(false);
   const [intelligenceEnabled, setIntelligenceEnabled] = React.useState(false);
+  const [taskAutoTitleEnabled, setTaskAutoTitleEnabled] = React.useState(false);
+  const [chatAutoTitleEnabled, setChatAutoTitleEnabled] = React.useState(false);
   const [savingIntelligence, setSavingIntelligence] = React.useState(false);
   const [trafficCapture, setTrafficCapture] = React.useState(false);
   const [agentTrafficBinding, setAgentTrafficBinding] = React.useState(false);
@@ -60,6 +62,8 @@ export default function SystemSettingsPage() {
     setCredentialAgent(!!s.credential_agent_enabled);
     setCredentialBinding(!!s.credential_traffic_binding);
     setIntelligenceEnabled(!!s.task_intelligence_enabled);
+    setTaskAutoTitleEnabled(!!s.task_auto_title_enabled);
+    setChatAutoTitleEnabled(!!s.chat_auto_title_enabled);
     setTrafficCapture(!!s.traffic_capture);
     setAgentTrafficBinding(!!s.agent_traffic_binding);
     setWebSearch(!!s.web_search_enabled);
@@ -229,6 +233,22 @@ export default function SystemSettingsPage() {
       });
   };
 
+  const toggleAutoTitle = (key: "task_auto_title_enabled" | "chat_auto_title_enabled", value: boolean) => {
+    const setter = key === "task_auto_title_enabled" ? setTaskAutoTitleEnabled : setChatAutoTitleEnabled;
+    const patch: Partial<Settings> =
+      key === "task_auto_title_enabled"
+        ? { task_auto_title_enabled: value }
+        : { chat_auto_title_enabled: value };
+    setter(value);
+    api
+      .setSettings(patch)
+      .then(apply)
+      .catch((e) => {
+        setter(!value);
+        toast.error("保存失败：" + (e as Error).message);
+      });
+  };
+
   // Persist a web-search patch (enable and/or backend). Optimistic with refetch.
   const saveWebSearch = (patch: Partial<Settings>) => {
     setSaving(true);
@@ -513,6 +533,39 @@ export default function SystemSettingsPage() {
           </CardContent>
         </Card>
 
+        <Card className="mb-4 break-inside-avoid md:mb-6">
+          <CardHeader>
+            <CardTitle>自动标题</CardTitle>
+            <CardDescription>为 Agent 创建的任务和对话首条消息生成简短标题。两个开关独立生效，默认关闭。</CardDescription>
+          </CardHeader>
+          <CardContent>
+            <Field orientation="horizontal">
+              <FieldContent>
+                <FieldLabel htmlFor="task-auto-title">任务名称</FieldLabel>
+                <FieldDescription>Agent 创建任务时自动生成任务名称；失败时保留未命名任务。</FieldDescription>
+              </FieldContent>
+              <Switch
+                id="task-auto-title"
+                checked={taskAutoTitleEnabled}
+                disabled={!loaded}
+                onCheckedChange={(value) => toggleAutoTitle("task_auto_title_enabled", value)}
+              />
+            </Field>
+            <Field orientation="horizontal" className="mt-5">
+              <FieldContent>
+                <FieldLabel htmlFor="chat-auto-title">会话标题</FieldLabel>
+                <FieldDescription>对话首条消息后自动生成会话标题；先显示消息截断文本，失败时保留截断标题。</FieldDescription>
+              </FieldContent>
+              <Switch
+                id="chat-auto-title"
+                checked={chatAutoTitleEnabled}
+                disabled={!loaded}
+                onCheckedChange={(value) => toggleAutoTitle("chat_auto_title_enabled", value)}
+              />
+            </Field>
+          </CardContent>
+        </Card>
+
         <Card className="mb-4 break-inside-avoid md:mb-6">
           <CardHeader>
             <CardTitle>任务情报</CardTitle>

web/src/lib/mock/data.ts

@@ -3327,6 +3327,8 @@ export const settings: Settings = {
   task_intelligence_enabled: false,
   credential_agent_enabled: false,
   credential_traffic_binding: false,
+  task_auto_title_enabled: false,
+  chat_auto_title_enabled: false,
   traffic_capture: true,
   agent_traffic_binding: false,
   llm_record: false,

web/src/lib/types.ts

@@ -969,6 +969,8 @@ export interface Settings {
   credential_agent_enabled: boolean;
   credential_traffic_binding: boolean;
   task_intelligence_enabled: boolean; // 默认关闭；关闭不注入情报工具或提示
+  task_auto_title_enabled: boolean; // Agent 创建任务时自动生成任务名称
+  chat_auto_title_enabled: boolean; // 对话首条消息后自动生成会话标题
   agent_traffic_binding: boolean; // Agent 自动绑定流量证据，默认关闭；不影响人工绑定
   llm_record: boolean; // LLM 录制开关（默认关）；关闭时不记录任何 LLM 调用
   // Web search. brave_key_set / tavily_key_set reflect whether a key is stored