refactor: reorganize package structure and decouple framework packages (#338)

* refactor: reorganize package structure and decouple framework packages

## Package Structure Reorganization
- Reorganized 55 packages into categorized subdirectories:
  - packages/framework/ - Generic framework (Laya/Cocos compatible)
  - packages/engine/ - ESEngine core modules
  - packages/rendering/ - Rendering modules (WASM dependent)
  - packages/physics/ - Physics modules
  - packages/streaming/ - World streaming
  - packages/network-ext/ - Network extensions
  - packages/editor/ - Editor framework and plugins
  - packages/rust/ - Rust WASM engine
  - packages/tools/ - Build tools and SDK

## Framework Package Decoupling
- Decoupled behavior-tree and blueprint packages from ESEngine dependencies
- Created abstracted interfaces (IBTAssetManager, IBehaviorTreeAssetContent)
- ESEngine-specific code moved to esengine/ subpath exports
- Framework packages now usable with Cocos/Laya without ESEngine

## CI Configuration
- Updated CI to only type-check and lint framework packages
- Added type-check:framework and lint:framework scripts

## Breaking Changes
- Package import paths changed due to directory reorganization
- ESEngine integrations now use subpath imports (e.g., '@esengine/behavior-tree/esengine')

* fix: update es-engine file path after directory reorganization

* docs: update README to focus on framework over engine

* ci: only build framework packages, remove Rust/WASM dependencies

* fix: remove esengine subpath from behavior-tree and blueprint builds

ESEngine integration code will only be available in full engine builds.
Framework packages are now purely engine-agnostic.

* fix: move network-protocols to framework, build both in CI

* fix: update workflow paths from packages/core to packages/framework/core

* fix: exclude esengine folder from type-check in behavior-tree and blueprint

* fix: update network tsconfig references to new paths

* fix: add test:ci:framework to only test framework packages in CI

* fix: only build core and math npm packages in CI

* fix: exclude test files from CodeQL and fix string escaping security issue

packages/engine/asset-system/src/interfaces/IAssetFileLoader.ts

@@ -0,0 +1,103 @@
+/**
+ * Asset File Loader Interface
+ * 资产文件加载器接口
+ *
+ * High-level file loading abstraction that combines path resolution
+ * with platform-specific file reading.
+ * 高级文件加载抽象，结合路径解析和平台特定的文件读取。
+ *
+ * This is the unified entry point for all file loading in the engine.
+ * Different from IAssetLoader (which parses content), this interface
+ * handles the actual file fetching from asset paths.
+ * 这是引擎中所有文件加载的统一入口。
+ * 与 IAssetLoader（解析内容）不同，此接口处理从资产路径获取文件。
+ */
+
+/**
+ * Asset file loader interface.
+ * 资产文件加载器接口。
+ *
+ * Provides a unified API for loading files from asset paths (relative to project).
+ * Different platforms provide their own implementations.
+ * 提供从资产路径（相对于项目）加载文件的统一 API。
+ * 不同平台提供各自的实现。
+ *
+ * @example
+ * ```typescript
+ * // Get global loader
+ * const loader = getGlobalAssetFileLoader();
+ *
+ * // Load image from asset path (relative to project)
+ * const image = await loader.loadImage('assets/demo/button.png');
+ *
+ * // Load text content
+ * const json = await loader.loadText('assets/config.json');
+ * ```
+ */
+export interface IAssetFileLoader {
+    /**
+     * Load image from asset path.
+     * 从资产路径加载图片。
+     *
+     * @param assetPath - Asset path relative to project (e.g., "assets/demo/button.png").
+     *                    相对于项目的资产路径。
+     * @returns Promise resolving to HTMLImageElement. | 返回 HTMLImageElement 的 Promise。
+     */
+    loadImage(assetPath: string): Promise<HTMLImageElement>;
+
+    /**
+     * Load text content from asset path.
+     * 从资产路径加载文本内容。
+     *
+     * @param assetPath - Asset path relative to project. | 相对于项目的资产路径。
+     * @returns Promise resolving to text content. | 返回文本内容的 Promise。
+     */
+    loadText(assetPath: string): Promise<string>;
+
+    /**
+     * Load binary data from asset path.
+     * 从资产路径加载二进制数据。
+     *
+     * @param assetPath - Asset path relative to project. | 相对于项目的资产路径。
+     * @returns Promise resolving to ArrayBuffer. | 返回 ArrayBuffer 的 Promise。
+     */
+    loadBinary(assetPath: string): Promise<ArrayBuffer>;
+
+    /**
+     * Check if asset file exists.
+     * 检查资产文件是否存在。
+     *
+     * @param assetPath - Asset path relative to project. | 相对于项目的资产路径。
+     * @returns Promise resolving to boolean. | 返回布尔值的 Promise。
+     */
+    exists(assetPath: string): Promise<boolean>;
+}
+
+/**
+ * Global asset file loader instance.
+ * 全局资产文件加载器实例。
+ */
+let globalAssetFileLoader: IAssetFileLoader | null = null;
+
+/**
+ * Set the global asset file loader.
+ * 设置全局资产文件加载器。
+ *
+ * Should be called during engine initialization with platform-specific implementation.
+ * 应在引擎初始化期间使用平台特定的实现调用。
+ *
+ * @param loader - Asset file loader instance or null. | 资产文件加载器实例或 null。
+ */
+export function setGlobalAssetFileLoader(loader: IAssetFileLoader | null): void {
+    globalAssetFileLoader = loader;
+}
+
+/**
+ * Get the global asset file loader.
+ * 获取全局资产文件加载器。
+ *
+ * @returns Asset file loader instance or null. | 资产文件加载器实例或 null。
+ */
+export function getGlobalAssetFileLoader(): IAssetFileLoader | null {
+    return globalAssetFileLoader;
+}