feat(task): 添加任务修订功能和超时处理机制

添加了 `revise_task` 路由动作类型，允许用户修改、纠正或重新执行最新活动任务结果。
实现了工具失败指导原则，防止相同类别工具重复失败。
为任务规划器添加了超时处理机制，避免长时间等待。

BREAKING CHANGE: 任务路由逻辑已更新，新增 `revise_task` 动作类型。

fix(api): 修复任务详情API返回完整流程投影

修复了任务详情API端点，现在会包含过滤后的流程运行、事件和工件信息，
并确保时间戳字段正确序列化。

refactor(engine): 优化任务技能解析器摘要节点处理

改进了任务技能解析器对摘要节点的处理逻辑，对于仅依赖文本生成功能的摘要节
点不再分配具体技能，直接使用依赖项输出进行汇总。

test: 增加任务修订和超时处理测试用例

添加了测试用例验证任务修订输入记录反馈、超时回退到单模式以及
摘要节点技能解析等新功能。

app-instance/backend/tests/unit/test_task_mode_feedback.py

@@ -290,6 +290,109 @@ def test_active_task_continues_until_llm_closes_it(tmp_path: Path) -> None:
     assert loaded.task_service.active_task_view("web:continue") is None
 
 
+def test_active_task_revision_input_records_feedback_and_reruns(tmp_path: Path) -> None:
+    service = AgentService(
+        loader=EngineLoader(
+            workspace=tmp_path,
+            task_execution_planner=_single_planner(),
+            validation_service=StubValidationService(
+                [
+                    ValidationResult(passed=True, score=0.9, validator="test"),
+                    ValidationResult(passed=True, score=0.95, validator="test"),
+                ]
+            ),
+        )
+    )
+
+    first = asyncio.run(
+        service.process_direct(
+            "查询珠海天气",
+            session_id="web:revise-direct",
+            provider_bundle=_bundle("珠海天气概览", route_action="new_task"),
+        )
+    )
+    second = asyncio.run(
+        service.process_direct(
+            "再详细一点，并加上明后天穿衣建议",
+            session_id="web:revise-direct",
+            provider_bundle=_bundle("更新后的珠海天气和穿衣建议", route_action="revise_task"),
+        )
+    )
+    loaded = service.create_loop().boot()
+    task = loaded.task_service.get_task(first.task_id)
+    messages = loaded.session_manager.get_messages_as_conversation(first.session_id)
+    first_assistant = [
+        message
+        for message in messages
+        if message.get("role") == "assistant" and message.get("run_id") == first.run_id
+    ][-1]
+    user_messages = [message.get("content") for message in messages if message.get("role") == "user"]
+
+    assert second.task_id == first.task_id
+    assert task is not None
+    assert task.status == "awaiting_feedback"
+    assert len(task.run_ids) == 2
+    assert task.feedback == [
+        {
+            "feedback_type": "revise",
+            "comment": "再详细一点，并加上明后天穿衣建议",
+            "run_id": first.run_id,
+            "created_at": task.feedback[0]["created_at"],
+        }
+    ]
+    assert first_assistant["feedback_state"] == "revise"
+    assert "再详细一点，并加上明后天穿衣建议" in user_messages
+
+
+def test_explicit_revision_feedback_then_input_reruns_without_duplicate_feedback(tmp_path: Path) -> None:
+    service = AgentService(
+        loader=EngineLoader(
+            workspace=tmp_path,
+            task_execution_planner=_single_planner(),
+            validation_service=StubValidationService(
+                [
+                    ValidationResult(passed=True, score=0.9, validator="test"),
+                    ValidationResult(passed=True, score=0.95, validator="test"),
+                ]
+            ),
+        )
+    )
+
+    first = asyncio.run(
+        service.process_direct(
+            "查询珠海天气",
+            session_id="web:explicit-revise",
+            provider_bundle=_bundle("珠海天气概览", route_action="new_task"),
+        )
+    )
+    feedback = asyncio.run(
+        service.submit_feedback(
+            session_id=first.session_id,
+            run_id=first.run_id,
+            feedback_type="revise",
+            comment="准备补充穿衣建议",
+        )
+    )
+    second = asyncio.run(
+        service.process_direct(
+            "加上明后天穿衣建议",
+            session_id="web:explicit-revise",
+            provider_bundle=_bundle("更新后的珠海天气和穿衣建议", route_action="revise_task"),
+        )
+    )
+    loaded = service.create_loop().boot()
+    task = loaded.task_service.get_task(first.task_id)
+
+    assert feedback["task_status"] == "needs_revision"
+    assert second.task_id == first.task_id
+    assert task is not None
+    assert task.status == "awaiting_feedback"
+    assert len(task.run_ids) == 2
+    assert len(task.feedback) == 1
+    assert task.feedback[0]["feedback_type"] == "revise"
+    assert task.feedback[0]["comment"] == "准备补充穿衣建议"
+
+
 def test_validation_failure_retries_once(tmp_path: Path) -> None:
     service = AgentService(
         loader=EngineLoader(
@@ -545,6 +648,8 @@ def test_task_mode_team_failure_still_uses_main_synthesis(tmp_path: Path) -> Non
     assert result.output_text == "fallback synthesized answer"
     assert any(event.event_type == "task_team_run_failed" for event in events)
     assert "sub-agent unavailable" in main_provider.calls[0][0]["content"]
+    assert "same class of tools fails repeatedly" in main_provider.calls[0][0]["content"]
+    assert "user-visible fallback answer" in main_provider.calls[0][0]["content"]
 
 
 def test_task_mode_team_retry_hides_first_synthesis_run(tmp_path: Path) -> None: