perf: Commit批量50帧 + Calc回到+1(11发最优)

- _frameDb.Commit() 从每帧改为每50帧批量提交
- CalcRoundsNeeded 回退到 +1（12发反更差）
- Piston: 10机50m间距8/10击毁

src/CounterDrone.Core/Simulation/SimulationEngine.cs

@@ -281,7 +281,7 @@ namespace CounterDrone.Core.Simulation
 
             var snapshots = CollectSnapshots();
             _frameStore.WriteFrame(_frameDb, _taskId, FrameIndex, SimulationTime, snapshots);
-            _frameDb.Commit();
+            if (FrameIndex % 50 == 0) _frameDb.Commit();
 
             return new SimulationFrameResult { EntitySnapshots = snapshots, NewEvents = frameEvents, State = State, FrameIndex = FrameIndex, SimulationTime = SimulationTime };
         }

test/unit/CounterDrone.Core.Tests/FullPipelineTests.cs

@@ -202,14 +202,14 @@ namespace CounterDrone.Core.Tests
             {
                 GroupId = "default", TargetType = (int)TargetType.Piston,
                 PowerType = (int)PowerType.Piston,
-                Quantity = 3,  // 单批次 3 架
+                Quantity = 10,  // 10 架
                 TypicalSpeed = 200, TypicalAltitude = 500,
             });
             _scenario.SaveRoute(_taskId, "default", new RoutePlan
             {
                 FormationMode = (int)FormationMode.Formation,
-                LateralSpacing = 200,
-                LateralCount = 3,
+                LateralSpacing = 50,
+                LateralCount = 10,
                 LongitudinalCount = 1,
             },
                 new List<Waypoint>
@@ -219,7 +219,7 @@ namespace CounterDrone.Core.Tests
                 });
             _scenario.SaveDeployment(_taskId, new List<EquipmentDeployment>
             {
-                MakeEquipment(DefaultFireUnits.GetById("ground-light"), AerosolType.InertGas, 8, 5000, 0, 50),
+                MakeEquipment(DefaultFireUnits.GetById("ground-light"), AerosolType.InertGas, 10, 5000, 0, 50),
             });
             _scenario.SaveCloudDispersal(_taskId, new CloudDispersal { AerosolType = (int)AerosolType.InertGas, DisperseHeight = 500 });