网络请求打通，ws 打通

apps/im_app/lib/data/remote/send_otp_request.dart

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+import 'package:json_annotation/json_annotation.dart';
+import 'package:networks_sdk/networks_sdk.dart';
+
+import 'package:im_app/core/foundation/api_paths.dart';
+
+part 'send_otp_request.g.dart';
+
+/// 发送验证码响应
+///
+/// code: 0 时 [expiryTime] 有值；
+/// code: 30174（触发图片验证）时 [android] / [ios] / [web] / [extras] 有值。
+class SendOtpResponse {
+  /// 验证码有效期（秒）
+  @JsonKey(name: 'expiry_time')
+  final int? expiryTime;
+
+  /// Android CAPTCHA SDK token
+  final String? android;
+
+  /// iOS CAPTCHA SDK token
+  final String? ios;
+
+  /// Web CAPTCHA SDK token
+  final String? web;
+
+  /// CAPTCHA 平台扩展参数（预留字段）
+  final Map<String, dynamic>? extras;
+
+  const SendOtpResponse({
+    this.expiryTime,
+    this.android,
+    this.ios,
+    this.web,
+    this.extras,
+  });
+}
+
+/// # /app/api/auth/vcode/get — 发送手机验证码
+///
+/// 响应 `data: { "expiry_time": 180 }`，返回验证码有效期（秒）。
+///
+/// ## 数据流位置
+///
+/// ```
+/// AuthRepositoryImpl.sendOtp(countryCode, contact)
+///   → _client.executeRequest( ★ SendOtpRequest ★ )     ← 你在这里
+///     → 服务端 POST /app/api/auth/vcode/get
+///     → 响应 { expiry_time: 180 } → SendOtpResponse
+/// ```
+@ApiRequest(
+  path: ApiPaths.authSendOtp,
+  method: HttpMethod.post,
+  responseType: SendOtpResponse,
+  requestType: ApiRequestType.login,
+)
+class SendOtpRequest extends ApiRequestable<SendOtpResponse>
+    with _$SendOtpRequestApi {
+  @JsonKey(name: 'country_code')
+  final String countryCode;
+  final String contact;
+
+  /// type=1 表示手机号验证
+  final int type;
+
+  SendOtpRequest({
+    required this.countryCode,
+    required this.contact,
+    this.type = 1,
+  });
+}