chore: add changeset for HTTP file routing (#404)

.changeset/http-file-routing.md

@@ -0,0 +1,44 @@
+---
+"@esengine/server": minor
+"@esengine/rpc": patch
+---
+
+feat(server): add HTTP file-based routing support / 添加 HTTP 文件路由支持
+
+New feature that allows organizing HTTP routes in separate files, similar to API and message handlers.
+新功能：支持将 HTTP 路由组织在独立文件中，类似于 API 和消息处理器的文件路由方式。
+
+```typescript
+// src/http/login.ts
+import { defineHttp } from '@esengine/server'
+
+export default defineHttp<{ username: string; password: string }>({
+    method: 'POST',
+    handler(req, res) {
+        const { username, password } = req.body
+        res.json({ token: '...', userId: '...' })
+    }
+})
+```
+
+Server configuration / 服务器配置:
+
+```typescript
+const server = await createServer({
+    port: 8080,
+    httpDir: 'src/http',      // HTTP routes directory / HTTP 路由目录
+    httpPrefix: '/api',        // Route prefix / 路由前缀
+    cors: true,
+})
+```
+
+File naming convention / 文件命名规则:
+- `login.ts` → POST /api/login
+- `users/profile.ts` → POST /api/users/profile
+- `users/[id].ts` → POST /api/users/:id (dynamic routes / 动态路由)
+- Set `method: 'GET'` in defineHttp for GET requests / 在 defineHttp 中设置 `method: 'GET'` 以处理 GET 请求
+
+Also includes / 还包括:
+- `defineHttp<TBody>()` helper for type-safe route definitions / 类型安全的路由定义辅助函数
+- Support for merging file routes with inline `http` config / 支持文件路由与内联 `http` 配置合并
+- RPC server supports attaching to existing HTTP server via `server` option / RPC 服务器支持通过 `server` 选项附加到现有 HTTP 服务器