Complete Cocos Creator port with level bundles, themes, and tooling.

Adds level prefabs, theme assets, audio, extensions, and deployment scripts for the Unity WebGL migration.

Co-authored-by: Cursor <cursoragent@cursor.com>

assets/scripts/core/GridConstants.ts

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+/** 等距网格常量（独立模块，避免 AppBootstrap ↔ GridCoords 循环依赖） */
+export const CELL_PIXEL = 100;
+
+/** Unity Player.prefab moveSpeed=1.2、Vehicle.prefab=1，按格子像素等比换算 */
+export const UNITY_PLAYER_MOVE_SPEED = 1.2;
+export const UNITY_VEHICLE_MOVE_SPEED = 1;
+/** Unity PlayerController 跳上 JumpBlock 时 targetPosition.y += 0.15 */
+export const UNITY_JUMP_ARC_OFFSET = 0.15;
+
+/** 移动中拾取：步进进度达到该比例且进入道具格后才消失（0–1） */
+export const PROP_COLLECT_MOVE_PROGRESS = 0.62;
+
+/** 移动中拾取：角色与道具世界距离上限（相对 CELL_PIXEL） */
+export const PROP_COLLECT_TOUCH_RADIUS = 0.42;
+
+export function scaledJumpArcOffset(): number {
+    return UNITY_JUMP_ARC_OFFSET * CELL_PIXEL;
+}
+
+export function scaledMoveSpeed(unitySpeed: number): number {
+    return unitySpeed * CELL_PIXEL;
+}
+
+/** 与 Unity Web 模板 canvas 一致（Template/index.html 960×600） */
+export const DESIGN_WIDTH = 960;
+export const DESIGN_HEIGHT = 600;
+
+/** Unity Main Camera orthographicSize=5 → 半高 500px（世界尺度，不随设计分辨率变） */
+export const CAMERA_ORTHO_HALF = 500;
+
+export function getHalfCellSize(): { halfW: number; halfH: number } {
+    return { halfW: CELL_PIXEL * 0.5, halfH: CELL_PIXEL * 0.25 };
+}