refactor: 项目更名为 DiAL（统一拨测平台）

将 gateway-checker/Gateway Checker 统一替换为 dial-server/DiAL
- 包名、可执行文件名、API service 标识改为 dial-server
- UI 标题改为 DiAL，副标题改为统一拨测平台
- 同步更新测试断言、构建脚本、示例配置和文档

src/server/app.ts

@@ -244,7 +244,7 @@ function formatDuration(ms: number): string {
 function createHealthResponse(): HealthResponse {
   return {
     ok: true,
-    service: "gateway-checker",
+    service: "dial-server",
     timestamp: new Date().toISOString(),
   };
 }

src/server/config.ts

@@ -1,6 +1,6 @@
 export function readRuntimeConfig(argv: string[] = process.argv.slice(2)): { configPath: string } {
   if (argv.length === 0) {
-    throw new Error("需要指定 YAML 配置文件路径\n用法: gateway-checker <config.yaml>");
+    throw new Error("需要指定 YAML 配置文件路径\n用法: dial-server <config.yaml>");
   }
 
   return { configPath: argv[0]! };

src/server/server.ts

@@ -23,7 +23,7 @@ export function startServer(options: StartServerOptions) {
     }),
   });
 
-  console.log(`Gateway Checker listening on ${server.url}`);
+  console.log(`DiAL listening on ${server.url}`);
 
   return server;
 }