refactor: 整理技能与战斗相关的配置与逻辑

1.  新增技能飞行距离配置项，支持自定义直线技能飞行距离
2.  调整英雄后退击退范围从30改为20
3.  重构击退逻辑，统一敌我双方的边界钳制处理
4.  优化Boss数值配置，固定基础面板为初始英雄2倍强度
5.  修正技能6006的动画资源引用为atk1
6.  调整近战英雄默认停火距离从80改为60
7.  更新注释文档与配置注释，优化代码可读性

assets/script/game/skill/SMoveSystem.ts

@@ -83,21 +83,36 @@ export class SMoveSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate
                 const direction = new Vec3();
                 Vec3.subtract(direction, originTargetPos, adjustedStartPos);
 
-                // 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;
+                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();
+                    adjustedTargetPos = v3(
+                        adjustedStartPos.x + direction.x * moveComp.distance,
+                        adjustedStartPos.y + direction.y * moveComp.distance,
+                        originTargetPos.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);
+                    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
+                    );
                 }
 
-                const adjustedTargetPos = v3(
-                    targetX,
-                    targetY,
-                    originTargetPos.z
-                );
-
                 moveComp.startPos.set(adjustedStartPos);
                 moveComp.targetPos.set(adjustedTargetPos);
                 node.setPosition(adjustedStartPos);