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

server/orchestration.go

@@ -251,7 +251,7 @@ func (s *Server) toolSpawnTask() actool.CoreTool {
 			"plan_heartbeat_seconds": map[string]any{"type": "integer", "description": "可选：planner 心跳触发间隔(秒)。距上轮规划结束/任务开始满该值且期间无触发 → 触发一轮规划(兜底死锁 + 唤醒去监督飞行中的 worker)。留空或 0 = 默认 600(10min)；"},
 			"seed_first_intent":      map[string]any{"type": "boolean", "description": "可选：对于简单任务可开启，创建时直接下发一条种子意图(内容=描述+目标)让 worker 免等首轮 planner 直接开跑测试；默认 false(走标准先规划再执行)。"},
 		}, "description", "goal"),
-		func(_ context.Context, in json.RawMessage) (actool.Result, error) {
+		func(ctx context.Context, in json.RawMessage) (actool.Result, error) {
 			var a struct {
 				Description          string          `json:"description"`
 				Goal                 string          `json:"goal"`
@@ -305,7 +305,22 @@ func (s *Server) toolSpawnTask() actool.CoreTool {
 			if pin != nil {
 				llmIDs = []int64{*pin}
 			}
+			name := ""
+			if s.m.pg.GetBool(db.SettingTaskAutoTitle, false) {
+				if active, activeErr := s.m.pg.ActiveProfile(); activeErr == nil && active != nil {
+					if prov, _, providerOK := s.providerForProfile(active.ID); providerOK {
+						if generated, titleErr := agent.GenerateAutoTitle(ctx, prov, a.Description+"\n"+a.Goal); titleErr == nil {
+							name = generated
+						} else {
+							log.Printf("[auto-title] task %s: %v", a.Description, titleErr)
+						}
+					} else {
+						log.Printf("[auto-title] task provider unavailable for active profile %d", active.ID)
+					}
+				}
+			}
 			t, err := s.m.CreateTaskWithOptions(a.Description, a.Goal, db.TaskCreateOptions{
+				Name:                 name,
 				SourceTaskIDs:        sourceIDs,
 				LLMProfileIDs:        llmIDs,
 				TimeoutSeconds:       a.TimeoutSeconds,