feat(spatial): 空间查询和索引系统 (#324)

* feat(spatial): 添加空间查询包

- ISpatialQuery: 空间查询接口
  - findInRadius, findInRect, findNearest, findKNearest
  - raycast, raycastFirst
  - IBounds, IRaycastHit, SpatialFilter 类型

- ISpatialIndex: 空间索引接口
  - insert, remove, update, clear, getAll

- GridSpatialIndex: 网格空间索引实现
  - 基于均匀网格的空间划分
  - 支持所有 ISpatialQuery 操作

- 工具函数
  - createBounds, isPointInBounds, boundsIntersect
  - distanceSquared, distance

* feat(spatial): 添加空间查询蓝图节点

- 添加 FindInRadius/FindInRect/FindNearest/FindKNearest 节点
- 添加 Raycast/RaycastFirst 射线检测节点
- 每个节点包含模板和执行器
- 使用 menuPath: ['Spatial', ...] 组织节点菜单

packages/spatial/package.json

@@ -0,0 +1,41 @@
+{
+    "name": "@esengine/spatial",
+    "version": "1.0.0",
+    "description": "Spatial query and indexing system for ECS Framework / ECS 框架的空间查询和索引系统",
+    "type": "module",
+    "main": "./dist/index.js",
+    "module": "./dist/index.js",
+    "types": "./dist/index.d.ts",
+    "exports": {
+        ".": {
+            "import": "./dist/index.js",
+            "types": "./dist/index.d.ts"
+        }
+    },
+    "files": [
+        "dist",
+        "module.json"
+    ],
+    "scripts": {
+        "build": "tsup",
+        "build:watch": "tsup --watch",
+        "type-check": "tsc --noEmit",
+        "clean": "rimraf dist"
+    },
+    "dependencies": {
+        "tslib": "^2.8.1"
+    },
+    "devDependencies": {
+        "@esengine/ecs-framework": "workspace:*",
+        "@esengine/ecs-framework-math": "workspace:*",
+        "@esengine/blueprint": "workspace:*",
+        "@esengine/build-config": "workspace:*",
+        "@types/node": "^20.19.17",
+        "rimraf": "^5.0.0",
+        "tsup": "^8.0.0",
+        "typescript": "^5.8.3"
+    },
+    "publishConfig": {
+        "access": "public"
+    }
+}