feat(insights): first isights impemetation

lib/features/insights/models/insights_payload_model.dart

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+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'insights_payload_model.freezed.dart';
+part 'insights_payload_model.g.dart';
+
+/// Структура повторяет веб-`UserInsightsService::chartPayload()`, чтобы во второй
+/// итерации заменить только источник данных.
+@freezed
+abstract class InsightsPayloadModel with _$InsightsPayloadModel {
+  const factory InsightsPayloadModel({
+    required WeightChartModel weight,
+    required BmiChartModel bmi,
+    required MeasureChartModel measure,
+    DailyChartModel? daily,
+    IntraChartModel? intra,
+  }) = _InsightsPayloadModel;
+
+  factory InsightsPayloadModel.fromJson(Map<String, dynamic> json) =>
+      _$InsightsPayloadModelFromJson(json);
+}
+
+@freezed
+abstract class WeightChartModel with _$WeightChartModel {
+  const factory WeightChartModel({
+    @Default([]) List<String> labels,
+    @Default([]) List<double> values,
+    double? last,
+    double? delta,
+    @Default('') String headline,
+    @Default('') String unit,
+    @Default('') String deltaText,
+  }) = _WeightChartModel;
+
+  factory WeightChartModel.fromJson(Map<String, dynamic> json) =>
+      _$WeightChartModelFromJson(json);
+}
+
+@freezed
+abstract class BmiChartModel with _$BmiChartModel {
+  const factory BmiChartModel({
+    @Default([]) List<String> labels,
+    @Default([]) List<double> values,
+    double? last,
+    double? delta,
+    @Default('') String headline,
+    String? category,
+    @Default('') String deltaText,
+    @Default('') String hint,
+  }) = _BmiChartModel;
+
+  factory BmiChartModel.fromJson(Map<String, dynamic> json) =>
+      _$BmiChartModelFromJson(json);
+}
+
+@freezed
+abstract class MeasureChartModel with _$MeasureChartModel {
+  const factory MeasureChartModel({
+    @Default([]) List<String> labels,
+    @Default([]) List<double> waist,
+    @Default([]) List<double> chest,
+    @Default([]) List<double> hips,
+    @Default('') String headline,
+    @Default('') String deltaText,
+  }) = _MeasureChartModel;
+
+  factory MeasureChartModel.fromJson(Map<String, dynamic> json) =>
+      _$MeasureChartModelFromJson(json);
+}
+
+@freezed
+abstract class DailyChartModel with _$DailyChartModel {
+  const factory DailyChartModel({
+    @Default([]) List<String> labels,
+    @Default([]) List<double> kcal,
+    @Default([]) List<double> proteins,
+    @Default([]) List<double> fats,
+    @Default([]) List<double> carbs,
+    double? average,
+    double? percent,
+    @Default('') String headline,
+    @Default('') String deltaText,
+  }) = _DailyChartModel;
+
+  factory DailyChartModel.fromJson(Map<String, dynamic> json) =>
+      _$DailyChartModelFromJson(json);
+}
+
+@freezed
+abstract class IntraChartModel with _$IntraChartModel {
+  const factory IntraChartModel({
+    @Default([]) List<IntraBarModel> bars,
+    @Default([]) List<ScalePointModel> satiety,
+    @Default([]) List<ScalePointModel> mood,
+    double? wake,
+    double? sleep,
+    String? wakeLabel,
+    String? sleepLabel,
+    String? wakeText,
+    String? sleepText,
+    @Default('') String date,
+    @Default('') String maxDate,
+    @Default('') String dateLabel,
+    @Default(false) bool isToday,
+  }) = _IntraChartModel;
+
+  factory IntraChartModel.fromJson(Map<String, dynamic> json) =>
+      _$IntraChartModelFromJson(json);
+}
+
+/// Приём пищи: время `x` (часы 0–24) и калории из белков/жиров/углеводов.
+@freezed
+abstract class IntraBarModel with _$IntraBarModel {
+  const factory IntraBarModel({
+    required double x,
+    @Default(0) double p,
+    @Default(0) double f,
+    @Default(0) double c,
+  }) = _IntraBarModel;
+
+  factory IntraBarModel.fromJson(Map<String, dynamic> json) =>
+      _$IntraBarModelFromJson(json);
+}
+
+/// Точка шкалы 0–5 (сытость/настроение) в момент времени `x`.
+@freezed
+abstract class ScalePointModel with _$ScalePointModel {
+  const factory ScalePointModel({required double x, required double y}) =
+      _ScalePointModel;
+
+  factory ScalePointModel.fromJson(Map<String, dynamic> json) =>
+      _$ScalePointModelFromJson(json);
+}

lib/features/insights/models/insights_period.dart

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+/// Период для вкладок «Вес», «ИМТ» и «Замеры». Значение совпадает с `{period}` в
+/// `/api/profile/measure/weight/{period}`.
+enum BodyPeriod {
+  month('1'),
+  threeMonths('3'),
+  sixMonths('6'),
+  year('12'),
+  all('all');
+
+  const BodyPeriod(this.apiValue);
+
+  final String apiValue;
+}
+
+/// Период для вкладки «КБЖУ по дням» (используется со второй итерации).
+enum DailyPeriod {
+  week('7'),
+  twoWeeks('14'),
+  month('30'),
+  threeMonths('90'),
+  all('all');
+
+  const DailyPeriod(this.apiValue);
+
+  final String apiValue;
+}