feat: 添加多环境配置（local/dev/uat）

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/env.d.ts

@@ -6,3 +6,12 @@ declare module '*.vue' {
   const component: DefineComponent<{}, {}, any>
   export default component
 }
+
+interface ImportMetaEnv {
+  readonly VITE_API_BASE_URL: string
+  readonly VITE_APP_TITLE: string
+}
+
+interface ImportMeta {
+  readonly env: ImportMetaEnv
+}