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/camera/src/CameraSystem.ts

@@ -0,0 +1,52 @@
+/**
+ * Camera System
+ * 相机系统
+ */
+
+import { EntitySystem, Matcher, Entity, ECSSystem } from '@esengine/ecs-framework';
+import type { IRenderConfigService } from '@esengine/engine-core';
+import { CameraComponent } from './CameraComponent';
+
+@ECSSystem('Camera', { updateOrder: -100 })
+export class CameraSystem extends EntitySystem {
+    private renderConfig: IRenderConfigService;
+    private lastAppliedCameraId: number | null = null;
+
+    constructor(renderConfig: IRenderConfigService) {
+        // Match entities with CameraComponent
+        super(Matcher.empty().all(CameraComponent));
+        this.renderConfig = renderConfig;
+    }
+
+    protected override onBegin(): void {
+        // Will process cameras in process()
+    }
+
+    protected override process(entities: readonly Entity[]): void {
+        // Use first enabled camera
+        for (const entity of entities) {
+            if (!entity.enabled) continue;
+
+            const camera = entity.getComponent(CameraComponent);
+            if (!camera) continue;
+
+            // Only apply if camera changed
+            if (this.lastAppliedCameraId !== entity.id) {
+                this.applyCamera(camera);
+                this.lastAppliedCameraId = entity.id;
+            }
+
+            // Only use first active camera
+            break;
+        }
+    }
+
+    private applyCamera(camera: CameraComponent): void {
+        // Apply background color
+        const bgColor = camera.backgroundColor || '#000000';
+        const r = parseInt(bgColor.slice(1, 3), 16) / 255;
+        const g = parseInt(bgColor.slice(3, 5), 16) / 255;
+        const b = parseInt(bgColor.slice(5, 7), 16) / 255;
+        this.renderConfig.setClearColor(r, g, b, 1.0);
+    }
+}