fix(skill): 优化移动系统：简化飞行逻辑

重构移动系统

调整技能移动的朝向和目标点计算逻辑，改为仅按水平朝向飞行，移除基于缩放的固定水平移动，去掉高度差计算，简化目标点直接使用起始点高度。

assets/script/game/skill/SMoveSystem.ts

@@ -74,42 +74,24 @@ export class SMoveSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate
                     moveComp.startPos.z
                 );
 
-                const originTargetPos = v3(
-                    moveComp.targetPos.x,
-                    moveComp.targetPos.y,
-                    moveComp.targetPos.z
-                );
-
-                const direction = new Vec3();
-                Vec3.subtract(direction, originTargetPos, adjustedStartPos);
+                // 水平向前飞行：方向仅由朝向（scale）决定，忽略目标点的高度差
+                const forwardX = moveComp.scale > 0 ? 1 : -1;
 
                 let adjustedTargetPos: Vec3;
                 if (moveComp.distance > 0) {
-                    // 距离模式：沿起始指向目标的方向飞行固定距离
-                    if (direction.length() < 0.01) {
-                        // 起终点重合时退化为按朝向水平飞行
-                        direction.set(moveComp.scale > 0 ? 1 : -1, 0, 0);
-                    }
-                    direction.normalize();
+                    // 距离模式：沿水平方向飞行固定距离
                     adjustedTargetPos = v3(
-                        adjustedStartPos.x + direction.x * moveComp.distance,
-                        adjustedStartPos.y + direction.y * moveComp.distance,
-                        originTargetPos.z
+                        adjustedStartPos.x + forwardX * moveComp.distance,
+                        adjustedStartPos.y,
+                        adjustedStartPos.z
                     );
                 } else {
                     // 延长终止点，统一消亡点的x坐标为 +-500
                     const targetX = moveComp.scale > 0 ? 500 : -500;
-                    let targetY = originTargetPos.y;
-
-                    if (Math.abs(direction.x) > 0.01) {
-                        const slope = direction.y / direction.x;
-                        targetY = adjustedStartPos.y + slope * (targetX - adjustedStartPos.x);
-                    }
-
                     adjustedTargetPos = v3(
                         targetX,
-                        targetY,
-                        originTargetPos.z
+                        adjustedStartPos.y,
+                        adjustedStartPos.z
                     );
                 }