feat(investigations): add event impact and work-order feedback flows

Add isolated burst and pollution impact evidence, parallel work-order workflows, persisted notifications and graph updates.

Checkpoint current code. Known follow-ups remain for large pollution result previews and graceful geometry failure.

app/mcp/catalog.py

@@ -6,7 +6,7 @@ from mcp import types
 from app.mcp import models as m
 from app.mcp import calculation_models as jobs
 from app.mcp import extended_models as e
-from app.mcp.analysis_models import BurstDetectionInput, BurstLocationInput, ValveIsolationInput, LeakageIdentificationInput, NodeCoverageInput
+from app.mcp.analysis_models import BurstDetectionInput, BurstLocationInput, ContaminantSourceTraceInput, ValveIsolationInput, LeakageIdentificationInput, NodeCoverageInput
 from app.mcp.analysis_models import ScenarioInput, ContaminantSimulationInput, ValveClosureInput, FlushingInput, PressureRegulationInput, SensorPlacementInput
 
 
@@ -62,8 +62,9 @@ class QueryTool:
 
 
 _specs = [
+    ("run_contaminant_source_trace", "水污染候选溯源：提交由事件位置或监测映射取得的候选模型节点及事件窗，快速返回确定的已核验节点。当前为临时稳定选择，正式反演算法后续接入；不生成置信度。取得located_node后先展示节点、保存阶段结论并提现场核查/采样处置工单；工单与污染传播模拟、accident_element_type=node的隔离和影响分析并行，结果补入同一调查，不因算法来源停止", ContaminantSourceTraceInput, "simulation.run", "analysis", False, True),
     ("run_simulation", "按水力步长在在线业务模型上执行指定时间段的实时模拟；更新该时段的模型条件及实时基线，返回指定节点和管段结果；duration单位为秒，输出为在线模型结果，正式分析成果通过方案工具保存", ScenarioInput, "simulation.run", "analysis", False, True),
-    ("run_contaminant_simulation", "在隔离模型中模拟假设污染源的浓度传播；返回指定节点/管段结果，结果标注假设来源及模型预测范围", ContaminantSimulationInput, "simulation.run", "analysis", False, True),
+    ("run_contaminant_simulation", "在隔离模型中模拟假设污染源的浓度传播；include_impact_coverage=true时汇总全网节点整个模拟时段超过impact_threshold_mg_l的累计范围、首个超阈值报告时刻和峰值，并保存地图证据。阈值为情景展示条件，非饮用水安全限值；回放按当前模型独立估计，不读取实时SCADA。定位后先提现场核查/采样处置工单，工单审核派发与本计算并行，结果补入同一调查", ContaminantSimulationInput, "simulation.run", "analysis", False, True),
     ("analyze_valve_closure", "在隔离模型中模拟关阀的水力影响，返回指定节点/管段结果；现场阀门操作按业务审批执行", ValveClosureInput, "simulation.run", "analysis", False, True),
     ("analyze_flushing", "在隔离模型中评估指定排放节点、冲洗流量和关阀组合的水力结果；现场效果由执行回执和复测核验", FlushingInput, "simulation.run", "analysis", False, True),
     ("analyze_pressure_regulation", "在隔离模型中评估给定调泵序列和水箱初始水位的压力影响；输出为给定方案评估，现场调度按审批执行", PressureRegulationInput, "simulation.run", "analysis", False, True),
@@ -258,7 +259,7 @@ _specs += [
     ("get_task_run_history", "分页读取指定项目任务的运行历史", e.TaskHistoryInput, "operational_task.view", "task"),
     ("get_mutation_status", "读取当前身份和会话内的写入执行状态；started只表示已启动，超时后先核实目标数据，再按原请求接续", e.MutationStatusInput, "webgis.view", "task"),
     ("calculate_demand_allocation", "按管长权重分配总需水量到节点、区域或全网，返回分配建议，模型变更通过业务写入执行，按页返回", e.DemandAllocationInput, "webgis.view", "analysis", False, True),
-    ("run_burst_simulation", "在隔离模型中模拟假设管道破口面积的水力影响；返回给定情景的模拟结果，正式方案通过方案工具保存", e.BurstSimulationInput, "simulation.run", "analysis", False, True),
+    ("run_burst_simulation", "在隔离模型中模拟管道破口；include_impact_coverage=true时按起算同刻已有在线模拟计算全网节点压力下降及1/3/5米水头分档覆盖，保存为展示证据；回放仅用当前模型情景，不替代冻结观测", e.BurstSimulationInput, "simulation.run", "analysis", False, True),
     ("edit_model_element", "预览或增删改模型节点、管段、泵阀、水池和区域；变更范围为业务模型，现场设备操作按对应流程执行", e.ModelElementMutationInput, "webgis.edit", "asset", False, False, True),
     ("edit_model_configuration", "预览或修改模型需水量、模式、曲线、控制规则、水质及模拟选项", e.ConfigurationMutationInput, "webgis.edit", "asset", False, False, True),
     ("clean_scada_readings", "预览或清洗明确设备与24小时内时间窗的数据，写入cleaned_value", e.ScadaCleaningInput, "scada.clean", "observed", False, False, True),