feat: 添加跨平台运行时、资产系统和UI适配功能 (#256)

* feat(platform-common): 添加WASM加载器和环境检测API

* feat(rapier2d): 新增Rapier2D WASM绑定包

* feat(physics-rapier2d): 添加跨平台WASM加载器

* feat(asset-system): 添加运行时资产目录和bundle格式

* feat(asset-system-editor): 新增编辑器资产管理包

* feat(editor-core): 添加构建系统和模块管理

* feat(editor-app): 重构浏览器预览使用import maps

* feat(platform-web): 添加BrowserRuntime和资产读取

* feat(engine): 添加材质系统和着色器管理

* feat(material): 新增材质系统和着色器编辑器

* feat(tilemap): 增强tilemap编辑器和动画系统

* feat(modules): 添加module.json配置

* feat(core): 添加module.json和类型定义更新

* chore: 更新依赖和构建配置

* refactor(plugins): 更新插件模板使用ModuleManifest

* chore: 添加第三方依赖库

* chore: 移除BehaviourTree-ai和ecs-astar子模块

* docs: 更新README和文档主题样式

* fix: 修复Rust文档测试和添加rapier2d WASM绑定

* fix(tilemap-editor): 修复画布高DPI屏幕分辨率适配问题

* feat(ui): 添加UI屏幕适配系统(CanvasScaler/SafeArea)

* fix(ecs-engine-bindgen): 添加缺失的ecs-framework-math依赖

* fix: 添加缺失的包依赖修复CI构建

* fix: 修复CodeQL检测到的代码问题

* fix: 修复构建错误和缺失依赖

* fix: 修复类型检查错误

* fix(material-system): 修复tsconfig配置支持TypeScript项目引用

* fix(editor-core): 修复Rollup构建配置添加tauri external

* fix: 修复CodeQL检测到的代码问题

* fix: 修复CodeQL检测到的代码问题

packages/asset-system/src/loaders/JsonLoader.ts

@@ -3,14 +3,9 @@
  * JSON资产加载器
  */
 
-import {
-    AssetType,
-    IAssetLoadOptions,
-    IAssetMetadata,
-    IAssetLoadResult,
-    AssetLoadError
-} from '../types/AssetTypes';
-import { IAssetLoader, IJsonAsset } from '../interfaces/IAssetLoader';
+import { AssetType } from '../types/AssetTypes';
+import { IAssetLoader, IJsonAsset, IAssetParseContext } from '../interfaces/IAssetLoader';
+import { IAssetContent, AssetContentType } from '../interfaces/IAssetReader';
 
 /**
  * JSON loader implementation
@@ -19,144 +14,27 @@ import { IAssetLoader, IJsonAsset } from '../interfaces/IAssetLoader';
 export class JsonLoader implements IAssetLoader<IJsonAsset> {
     readonly supportedType = AssetType.Json;
     readonly supportedExtensions = ['.json', '.jsonc'];
+    readonly contentType: AssetContentType = 'text';
 
     /**
-     * Load JSON asset
-     * 加载JSON资产
+     * Parse JSON from text content.
+     * 从文本内容解析JSON。
      */
-    async load(
-        path: string,
-        metadata: IAssetMetadata,
-        options?: IAssetLoadOptions
-    ): Promise<IAssetLoadResult<IJsonAsset>> {
-        const startTime = performance.now();
-
-        try {
-            const response = await this.fetchWithTimeout(path, options?.timeout);
-
-            if (!response.ok) {
-                throw new Error(`HTTP error! status: ${response.status}`);
-            }
-
-            // 获取总大小用于进度回调 / Get total size for progress callback
-            const contentLength = response.headers.get('content-length');
-            const total = contentLength ? parseInt(contentLength, 10) : 0;
-
-            // 读取响应 / Read response
-            let jsonData: unknown;
-            if (options?.onProgress && total > 0) {
-                jsonData = await this.readResponseWithProgress(response, total, options.onProgress);
-            } else {
-                jsonData = await response.json();
-            }
-
-            const asset: IJsonAsset = {
-                data: jsonData
-            };
-
-            return {
-                asset,
-                handle: 0,
-                metadata,
-                loadTime: performance.now() - startTime
-            };
-        } catch (error) {
-            if (error instanceof Error) {
-                throw new AssetLoadError(
-                    `Failed to load JSON: ${error.message}`,
-                    metadata.guid,
-                    AssetType.Json,
-                    error
-                );
-            }
-            throw AssetLoadError.fileNotFound(metadata.guid, path);
+    async parse(content: IAssetContent, _context: IAssetParseContext): Promise<IJsonAsset> {
+        if (!content.text) {
+            throw new Error('JSON content is empty');
         }
+
+        return {
+            data: JSON.parse(content.text)
+        };
     }
 
-    /**
-     * Fetch with timeout
-     * 带超时的fetch
-     */
-    private async fetchWithTimeout(url: string, timeout = 30000): Promise<Response> {
-        const controller = new AbortController();
-        const timeoutId = setTimeout(() => controller.abort(), timeout);
-
-        try {
-            const response = await fetch(url, {
-                signal: controller.signal,
-                mode: 'cors',
-                credentials: 'same-origin'
-            });
-            return response;
-        } finally {
-            clearTimeout(timeoutId);
-        }
-    }
-
-    /**
-     * Read response with progress
-     * 带进度读取响应
-     */
-    private async readResponseWithProgress(
-        response: Response,
-        total: number,
-        onProgress: (progress: number) => void
-    ): Promise<unknown> {
-        const reader = response.body?.getReader();
-        if (!reader) {
-            return response.json();
-        }
-
-        const chunks: Uint8Array[] = [];
-        let receivedLength = 0;
-
-        while (true) {
-            const { done, value } = await reader.read();
-
-            if (done) break;
-
-            chunks.push(value);
-            receivedLength += value.length;
-
-            // 报告进度 / Report progress
-            onProgress(receivedLength / total);
-        }
-
-        // 合并chunks / Merge chunks
-        const allChunks = new Uint8Array(receivedLength);
-        let position = 0;
-        for (const chunk of chunks) {
-            allChunks.set(chunk, position);
-            position += chunk.length;
-        }
-
-        // 解码为字符串并解析JSON / Decode to string and parse JSON
-        const decoder = new TextDecoder('utf-8');
-        const jsonString = decoder.decode(allChunks);
-        return JSON.parse(jsonString);
-    }
-
-    /**
-     * Validate if the loader can handle this asset
-     * 验证加载器是否可以处理此资产
-     */
-    canLoad(path: string, _metadata: IAssetMetadata): boolean {
-        const ext = path.toLowerCase().substring(path.lastIndexOf('.'));
-        return this.supportedExtensions.includes(ext);
-    }
-
-    /**
-     * Estimate memory usage for the asset
-     * 估算资产的内存使用量
-     */
-
     /**
      * Dispose loaded asset
      * 释放已加载的资产
      */
     dispose(asset: IJsonAsset): void {
-        // JSON资产通常不需要特殊清理 / JSON assets usually don't need special cleanup
-        // 但可以清空引用以帮助GC / But can clear references to help GC
         (asset as any).data = null;
     }
 }