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/rendering/fairygui/src/render/IRenderBackend.ts

@@ -0,0 +1,140 @@
+import type { IRectangle } from '../utils/MathTypes';
+import type { IRenderPrimitive } from './IRenderCollector';
+
+/**
+ * Texture handle
+ * 纹理句柄
+ */
+export interface ITextureHandle {
+    /** Unique identifier | 唯一标识 */
+    readonly id: number;
+    /** Texture width | 纹理宽度 */
+    readonly width: number;
+    /** Texture height | 纹理高度 */
+    readonly height: number;
+    /** Is texture valid | 纹理是否有效 */
+    readonly isValid: boolean;
+}
+
+/**
+ * Font handle
+ * 字体句柄
+ */
+export interface IFontHandle {
+    /** Font family name | 字体名称 */
+    readonly family: string;
+    /** Is font loaded | 字体是否已加载 */
+    readonly isLoaded: boolean;
+}
+
+/**
+ * Render statistics
+ * 渲染统计
+ */
+export interface IRenderStats {
+    /** Draw call count | 绘制调用数 */
+    drawCalls: number;
+    /** Triangle count | 三角形数量 */
+    triangles: number;
+    /** Texture switches | 纹理切换次数 */
+    textureSwitches: number;
+    /** Batch count | 批次数量 */
+    batches: number;
+    /** Frame time in ms | 帧时间（毫秒） */
+    frameTime: number;
+}
+
+/**
+ * Render backend interface
+ *
+ * Abstract interface for graphics backend (WebGPU, WebGL, Canvas2D).
+ *
+ * 图形后端抽象接口（WebGPU、WebGL、Canvas2D）
+ */
+export interface IRenderBackend {
+    /** Backend name | 后端名称 */
+    readonly name: string;
+
+    /** Is backend initialized | 后端是否已初始化 */
+    readonly isInitialized: boolean;
+
+    /** Canvas width | 画布宽度 */
+    readonly width: number;
+
+    /** Canvas height | 画布高度 */
+    readonly height: number;
+
+    /**
+     * Initialize the backend
+     * 初始化后端
+     */
+    initialize(canvas: HTMLCanvasElement): Promise<boolean>;
+
+    /**
+     * Begin a new frame
+     * 开始新帧
+     */
+    beginFrame(): void;
+
+    /**
+     * End the current frame
+     * 结束当前帧
+     */
+    endFrame(): void;
+
+    /**
+     * Submit render primitives for rendering
+     * 提交渲染图元进行渲染
+     */
+    submitPrimitives(primitives: readonly IRenderPrimitive[]): void;
+
+    /**
+     * Set clip rectangle
+     * 设置裁剪矩形
+     */
+    setClipRect(rect: IRectangle | null): void;
+
+    /**
+     * Create a texture from image data
+     * 从图像数据创建纹理
+     */
+    createTexture(
+        source: ImageBitmap | HTMLImageElement | HTMLCanvasElement | ImageData
+    ): ITextureHandle;
+
+    /**
+     * Destroy a texture
+     * 销毁纹理
+     */
+    destroyTexture(texture: ITextureHandle): void;
+
+    /**
+     * Load a font
+     * 加载字体
+     */
+    loadFont(family: string, url?: string): Promise<IFontHandle>;
+
+    /**
+     * Resize the backend
+     * 调整后端大小
+     */
+    resize(width: number, height: number): void;
+
+    /**
+     * Get render statistics
+     * 获取渲染统计
+     */
+    getStats(): IRenderStats;
+
+    /**
+     * Dispose the backend
+     * 销毁后端
+     */
+    dispose(): void;
+}
+
+/**
+ * Backend factory function type
+ * 后端工厂函数类型
+ */
+export type RenderBackendFactory = () => IRenderBackend;