feat(ecs): 添加运行时环境区分机制 | add runtime environment detection (#398)

- Core 新增静态属性 runtimeEnvironment，支持 'server' | 'client' | 'standalone'
- Core 新增 isServer / isClient 静态只读属性
- ICoreConfig 新增 runtimeEnvironment 配置项
- Scene 新增 isServer / isClient 只读属性（默认从 Core 继承，可通过 config 覆盖）
- 新增 @ServerOnly() / @ClientOnly() / @NotServer() / @NotClient() 方法装饰器
- 更新中英文文档

用于网络游戏中区分服务端权威逻辑和客户端逻辑

docs/src/content/docs/en/guide/scene/index.md

@@ -71,6 +71,55 @@ class ConfiguredScene extends Scene {
 }
 ```
 
+## Runtime Environment
+
+For networked games, you can configure the runtime environment to distinguish between server and client logic.
+
+### Global Configuration (Recommended)
+
+Set the runtime environment once at the Core level - all Scenes will inherit this setting:
+
+```typescript
+import { Core } from '@esengine/ecs-framework';
+
+// Method 1: Set in Core.create()
+Core.create({ runtimeEnvironment: 'server' });
+
+// Method 2: Set static property directly
+Core.runtimeEnvironment = 'server';
+```
+
+### Per-Scene Override
+
+Individual scenes can override the global setting:
+
+```typescript
+const clientScene = new Scene({ runtimeEnvironment: 'client' });
+```
+
+### Environment Types
+
+| Environment | Use Case |
+|-------------|----------|
+| `'standalone'` | Single-player games (default) |
+| `'server'` | Game server, authoritative logic |
+| `'client'` | Game client, rendering/input |
+
+### Checking Environment in Systems
+
+```typescript
+class CollectibleSpawnSystem extends EntitySystem {
+  private checkCollections(): void {
+    // Skip on client - only server handles authoritative logic
+    if (!this.scene.isServer) return;
+
+    // Server-authoritative spawn logic...
+  }
+}
+```
+
+See [System Runtime Decorators](/en/guide/system/index#runtime-environment-decorators) for decorator-based approach.
+
 ### Running a Scene
 
 ```typescript

docs/src/content/docs/en/guide/system/index.md

@@ -160,6 +160,53 @@ scene.addSystem(new SystemA()); // addOrder = 0, executes first
 scene.addSystem(new SystemB()); // addOrder = 1, executes second
 ```
 
+## Runtime Environment Decorators
+
+For networked games, you can use decorators to control which environment a system method runs in.
+
+### Available Decorators
+
+| Decorator | Effect |
+|-----------|--------|
+| `@ServerOnly()` | Method only executes on server |
+| `@ClientOnly()` | Method only executes on client |
+| `@NotServer()` | Method skipped on server |
+| `@NotClient()` | Method skipped on client |
+
+### Usage Example
+
+```typescript
+import { EntitySystem, ServerOnly, ClientOnly } from '@esengine/ecs-framework';
+
+class GameSystem extends EntitySystem {
+  @ServerOnly()
+  private spawnEnemies(): void {
+    // Only runs on server - authoritative spawn logic
+  }
+
+  @ClientOnly()
+  private playEffects(): void {
+    // Only runs on client - visual effects
+  }
+}
+```
+
+### Simple Conditional Check
+
+For simple cases, a direct check is often clearer than decorators:
+
+```typescript
+class CollectibleSystem extends EntitySystem {
+  private checkCollections(): void {
+    if (!this.scene.isServer) return;  // Skip on client
+
+    // Server-authoritative logic...
+  }
+}
+```
+
+See [Scene Runtime Environment](/en/guide/scene/index#runtime-environment) for configuration details.
+
 ## Next Steps
 
 - [System Types](/en/guide/system/types) - Learn about different system base classes

docs/src/content/docs/guide/scene/index.md

@@ -71,6 +71,55 @@ class ConfiguredScene extends Scene {
 }
 ```
 
+## 运行时环境
+
+对于网络游戏，你可以配置运行时环境来区分服务端和客户端逻辑。
+
+### 全局配置（推荐）
+
+在 Core 层级设置一次运行时环境，所有场景都会继承此设置：
+
+```typescript
+import { Core } from '@esengine/ecs-framework';
+
+// 方式1：在 Core.create() 中设置
+Core.create({ runtimeEnvironment: 'server' });
+
+// 方式2：直接设置静态属性
+Core.runtimeEnvironment = 'server';
+```
+
+### 单个场景覆盖
+
+个别场景可以覆盖全局设置：
+
+```typescript
+const clientScene = new Scene({ runtimeEnvironment: 'client' });
+```
+
+### 环境类型
+
+| 环境 | 使用场景 |
+|------|----------|
+| `'standalone'` | 单机游戏（默认） |
+| `'server'` | 游戏服务器，权威逻辑 |
+| `'client'` | 游戏客户端，渲染/输入 |
+
+### 在系统中检查环境
+
+```typescript
+class CollectibleSpawnSystem extends EntitySystem {
+  private checkCollections(): void {
+    // 客户端跳过 - 只有服务端处理权威逻辑
+    if (!this.scene.isServer) return;
+
+    // 服务端权威生成逻辑...
+  }
+}
+```
+
+参见 [系统运行时装饰器](/guide/system/index#运行时环境装饰器) 了解基于装饰器的方式。
+
 ### 运行场景
 
 ```typescript

docs/src/content/docs/guide/system/index.md

@@ -160,6 +160,53 @@ scene.addSystem(new SystemA()); // addOrder = 0，先执行
 scene.addSystem(new SystemB()); // addOrder = 1，后执行
 ```
 
+## 运行时环境装饰器
+
+对于网络游戏，你可以使用装饰器来控制系统方法在哪个环境下执行。
+
+### 可用装饰器
+
+| 装饰器 | 效果 |
+|--------|------|
+| `@ServerOnly()` | 方法仅在服务端执行 |
+| `@ClientOnly()` | 方法仅在客户端执行 |
+| `@NotServer()` | 方法在服务端跳过 |
+| `@NotClient()` | 方法在客户端跳过 |
+
+### 使用示例
+
+```typescript
+import { EntitySystem, ServerOnly, ClientOnly } from '@esengine/ecs-framework';
+
+class GameSystem extends EntitySystem {
+  @ServerOnly()
+  private spawnEnemies(): void {
+    // 仅在服务端运行 - 权威生成逻辑
+  }
+
+  @ClientOnly()
+  private playEffects(): void {
+    // 仅在客户端运行 - 视觉效果
+  }
+}
+```
+
+### 简单条件检查
+
+对于简单场景，直接检查通常比装饰器更清晰：
+
+```typescript
+class CollectibleSystem extends EntitySystem {
+  private checkCollections(): void {
+    if (!this.scene.isServer) return;  // 客户端跳过
+
+    // 服务端权威逻辑...
+  }
+}
+```
+
+参见 [场景运行时环境](/guide/scene/index#运行时环境) 了解配置详情。
+
 ## 下一步
 
 - [系统类型](/guide/system/types) - 了解不同类型的系统基类