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/material-system/src/loaders/MaterialLoader.ts

@@ -0,0 +1,64 @@
+/**
+ * Material asset loader.
+ * 材质资产加载器。
+ */
+
+import {
+    AssetType,
+    IAssetContent,
+    IAssetParseContext
+} from '@esengine/asset-system';
+import type { IAssetLoader, AssetContentType } from '@esengine/asset-system';
+import { Material } from '../Material';
+
+/**
+ * Material asset data structure.
+ * 材质资产数据结构。
+ */
+export interface IMaterialAssetData {
+    /** Material instance. | 材质实例。 */
+    material: Material;
+    /** Material definition data. | 材质定义数据。 */
+    definition: Record<string, unknown>;
+}
+
+/**
+ * Material file loader.
+ * 材质文件加载器。
+ */
+export class MaterialLoader implements IAssetLoader<IMaterialAssetData> {
+    readonly supportedType = AssetType.Material;
+    readonly supportedExtensions = ['.mat'];
+    readonly contentType: AssetContentType = 'text';
+
+    /**
+     * Parse material from content.
+     * 从内容解析材质。
+     */
+    async parse(content: IAssetContent, context: IAssetParseContext): Promise<IMaterialAssetData> {
+        if (!content.text) {
+            throw new Error('Material content is empty');
+        }
+
+        const data = JSON.parse(content.text);
+
+        // Support wrapper format: { material: {...} }
+        const materialDef = data.material || data;
+
+        // Create material from definition.
+        const material = Material.fromDefinition(materialDef);
+
+        return {
+            material,
+            definition: materialDef
+        };
+    }
+
+    /**
+     * Dispose material asset.
+     * 释放材质资产。
+     */
+    dispose(_asset: IMaterialAssetData): void {
+        // Material cleanup if needed.
+    }
+}

packages/engine/material-system/src/loaders/ShaderLoader.ts

@@ -0,0 +1,87 @@
+/**
+ * Shader asset loader.
+ * 着色器资产加载器。
+ */
+
+import {
+    AssetType,
+    IAssetContent,
+    IAssetParseContext
+} from '@esengine/asset-system';
+import type { IAssetLoader, AssetContentType } from '@esengine/asset-system';
+import { Shader } from '../Shader';
+import type { ShaderDefinition } from '../types';
+
+/**
+ * Shader asset data structure.
+ * 着色器资产数据结构。
+ */
+export interface IShaderAssetData {
+    /** Shader instance. | 着色器实例。 */
+    shader: Shader;
+    /** Shader definition data. | 着色器定义数据。 */
+    definition: ShaderDefinition;
+}
+
+/**
+ * Shader file format.
+ * 着色器文件格式。
+ *
+ * ```json
+ * {
+ *   "version": 1,
+ *   "shader": {
+ *     "name": "CustomShader",
+ *     "vertexSource": "...",
+ *     "fragmentSource": "...",
+ *     "uniforms": { ... }
+ *   }
+ * }
+ * ```
+ */
+export interface ShaderFileFormat {
+    version: number;
+    shader: ShaderDefinition;
+}
+
+/**
+ * Shader file loader.
+ * 着色器文件加载器。
+ */
+export class ShaderLoader implements IAssetLoader<IShaderAssetData> {
+    readonly supportedType = AssetType.Shader;
+    readonly supportedExtensions = ['.shader'];
+    readonly contentType: AssetContentType = 'text';
+
+    /**
+     * Parse shader from content.
+     * 从内容解析着色器。
+     */
+    async parse(content: IAssetContent, context: IAssetParseContext): Promise<IShaderAssetData> {
+        if (!content.text) {
+            throw new Error('Shader content is empty');
+        }
+
+        const data = JSON.parse(content.text) as ShaderFileFormat;
+
+        if (!data.shader) {
+            throw new Error('Invalid shader file: missing shader definition');
+        }
+
+        const shaderDef = data.shader;
+        const shader = Shader.fromDefinition(shaderDef);
+
+        return {
+            shader,
+            definition: shaderDef
+        };
+    }
+
+    /**
+     * Dispose shader asset.
+     * 释放着色器资产。
+     */
+    dispose(_asset: IShaderAssetData): void {
+        // Shader cleanup if needed.
+    }
+}