feat: Refactor server implementation to support Bun and Node environments

- Introduced `ServerNode` and `BunServer` classes to handle server logic for Node and Bun respectively.
- Updated `App` class to initialize the appropriate server based on the runtime environment.
- Enhanced `parseBody` function to handle request body parsing for both environments.
- Modified WebSocket handling to support Bun's WebSocket upgrade mechanism.
- Improved error handling and response structure across the server implementation.
- Added support for custom middleware in the server's request handling.
- Refactored server base functionality into `ServerBase` for better code organization.
- Updated type definitions to reflect changes in server options and listener handling.
- Added a new demo for testing the server functionality with various request types.

src/index.ts

@@ -5,7 +5,7 @@ export type { RouteContext, RouteOpts, RouteMiddleware } from './route.ts';
 
 export type { Run } from './route.ts';
 
-export { Server, handleServer } from './server/index.ts';
+export { ServerNode, handleServer } from './server/index.ts';
 /**
  * 自定义错误
  */
@@ -13,7 +13,7 @@ export { CustomError } from './result/error.ts';
 
 export { createSchema } from './validator/index.ts';
 
-export type { Rule, Schema,  } from './validator/index.ts';
+export type { Rule, Schema, } from './validator/index.ts';
 
 export { App } from './app.ts';