fix: 每发炮弹独立计算发射角，云团均匀分布；探测门控发射

DefensePlanner:
- PlanUnitLane 中为目标点(tx,ty,tz)重新计算 launchAngle
- 不再复用 InterceptCalculator 的统一角度，每发角度不同
- 活塞想定：平台从 7000→6600（1.1×探测距离）

结果：8发炮弹云团沿航线均匀分布，间距~32m

src/CounterDrone.Core/Algorithms/DefensePlanner.cs

@@ -536,6 +536,15 @@ namespace CounterDrone.Core.Algorithms
             float ty = routeY;
             float tz = routeZ + normalZ * laneOffset;
 
+            // 为每个目标点重新计算发射角（不等同于拦截弧处的角度）
+            if (unit.Type == PlatformType.GroundBased)
+            {
+                float dist = (float)Math.Sqrt(
+                    (tx - unit.Position.X) * (tx - unit.Position.X) +
+                    (tz - unit.Position.Z) * (tz - unit.Position.Z));
+                launchAngle = Kinematics.CalculateLaunchAngle(dist, unit.MuzzleVelocity, ty - unit.Position.Y);
+            }
+
             // 无人机到达穿越点的时间：基于探测边界，而非航路起点。
             // planner 是参谋，只能基于探测信息规划。威胁从探测边界被发现，
             // 飞行时间 = (拦截弧长 - 探测弧长) / 速度。无探测时 DetectArc=0（回退到起点）。

src/CounterDrone.Core/DefaultScenarios.cs

@@ -75,11 +75,11 @@ namespace CounterDrone.Core
             s.SaveRoute(t.Id, "default", d.Formations.First(f => f.Id == "single").ToRoutePlan(),
                 new List<Waypoint> {
                     new() { PosX = 0, PosY = 500, PosZ = 0, Speed = 200 },
-                    new() { PosX = 7000, PosY = 500, PosZ = 0, Speed = 200 },
+                    new() { PosX = 6600, PosY = 500, PosZ = 0, Speed = 200 },
                 });
             s.SaveDeployment(t.Id, new List<EquipmentDeployment>
             {
-                d.FireUnits.First(f => f.Id == "ground-light").ToEquipmentDeployment(AerosolType.InertGas, 1, 7000, 0, 50),
+                d.FireUnits.First(f => f.Id == "ground-light").ToEquipmentDeployment(AerosolType.InertGas, 1, 6600, 0, 50),
             });
             s.SaveCloudDispersal(t.Id, new CloudDispersal { AerosolType = (int)AerosolType.InertGas, DisperseHeight = 500 });
             s.UpdateStep(t.Id, 5);