feat(deep-research): 强化任务链路可靠性并接入 agentfx 报告助手种子

功能说明：\n- 重构 Deep Research 调度与执行链，补齐 dispatcher、executor、live hub 与依赖注入入口，提升任务下发、执行、回调的稳定性\n- 增强运行时持久化与恢复能力，接入业务映射、任务来源与任务事件日志模型，覆盖持久化与执行可靠性关键路径测试\n- 新增 agentfx 报告助手 seed 与任务报告导入脚本配置，支持离线环境快速初始化与任务流模板回填\n- 完善 deep-research 与 thread_runs 路由参数编排，兼容不同业务映射与运行入口的前后端联动\n- 补充前端 agentfx deep-link 解析，保证 deep-research 场景下的登录跳转与任务上下文一致

offline-backend-20260512/backend/tests/test_deep_research_executor_reliability.py

@@ -42,6 +42,8 @@ async def test_report_is_persisted_before_job_is_marked_completed():
         "drs_1",
         "worker_1",
         DeepResearchResult(report_markdown="# 报告", source_ids=["src_1"]),
+        user_id="user_1",
+        query="课题",
     )
 
     assert sessions.report_updates[0]["report_markdown"] == "# 报告"
@@ -62,6 +64,8 @@ async def test_report_projection_failure_never_marks_job_completed(monkeypatch):
             "drs_1",
             "worker_1",
             DeepResearchResult(report_markdown="# 报告"),
+            user_id="user_1",
+            query="课题",
         )
 
     assert jobs.progress_calls == []
@@ -70,3 +74,26 @@ async def test_report_projection_failure_never_marks_job_completed(monkeypatch):
 def test_terminal_timeline_events_are_valid_durable_event_types():
     assert DeepResearchEvent(type="job_completed", phase="done").type == "job_completed"
     assert DeepResearchEvent(type="job_failed", phase="done").type == "job_failed"
+
+
+def test_zero_source_fallback_is_a_valid_completed_report():
+    from app.gateway.deep_research_job_executor import _terminal_report_validation_error
+    from deerflow.agents.deep_research.runners.basic import _build_report_fallback
+
+    report = _build_report_fallback("没有命中的课题", "", 0)
+    assert _terminal_report_validation_error(report) is None
+    assert "没有命中的课题" in report
+
+
+def test_source_table_reload_does_not_become_session_error():
+    from app.gateway.deep_research_job_executor import _session_diagnostic_error
+
+    assert _session_diagnostic_error(
+        [
+            {
+                "code": "client_materials_reloaded_before_write",
+                "stage": "collecting",
+                "detail": "写作前再次从素材表读到 15 条",
+            }
+        ]
+    ) is None