fix(map): correct hero position calculation and loop order

修复了MissionHeroComp的遍历顺序，同时修正了MissionCardComp中的节点索引计算逻辑，匹配实际的视觉排布和MoveComp中的赋值规则，添加了调试日志方便排查位置问题。

assets/script/game/map/MissionHeroComp.ts

@@ -197,8 +197,8 @@ export class MissionHeroCompComp extends CCComp {
         
         // 优先中路(1) -> 上路(0) -> 下路(2)
         const priority = [1, 0, 2];
-        for (const lane of priority) {
-            for (let indexInLane = 0; indexInLane < MissionHeroCompComp.HERO_LANE_CAP; indexInLane++) {
+        for (let indexInLane = 0; indexInLane < MissionHeroCompComp.HERO_LANE_CAP; indexInLane++) {
+            for (const lane of priority) {
                 if (!occupied[lane][indexInLane]) {
                     return { lane, indexInLane };
                 }