feat(common): 新增基础设施 HAR（网络/鉴权/日志/状态/工具）

common/src/main/ets/Index.ets

@@ -0,0 +1,8 @@
+export { HttpClient } from './network/HttpClient';
+export { HttpInterceptor } from './network/HttpInterceptor';
+export { AuthInterceptor } from './network/AuthInterceptor';
+export { ApiError } from './network/ApiError';
+export { ApiResult } from './network/ApiResult';
+export { SessionStore, SessionManager } from './state/SessionStore';
+export { Logger } from './logging/Logger';
+export { FormatUtil } from './utils/FormatUtil';