feat: Initial iOS Health Dashboard app (Swift + SwiftUI)

PulseHealth/Models/AuthModels.swift

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+import Foundation
+struct LoginRequest: Codable { let email: String; let password: String }
+struct LoginResponse: Codable { let token: String; let user: UserInfo }
+struct UserInfo: Codable { let id: Int; let email: String; let name: String }
+struct ProfileResponse: Codable { let user: UserInfo; let apiKey: String? }

PulseHealth/Models/HealthModels.swift

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+import Foundation
+struct ReadinessResponse: Codable {
+    let score: Int; let status: String; let recommendation: String
+    let date: String?; let factors: ReadinessFactors?
+}
+struct ReadinessFactors: Codable {
+    let sleep: FactorScore; let hrv: FactorScore; let rhr: FactorScore; let activity: FactorScore
+}
+struct FactorScore: Codable { let score: Int; let value: String; let baseline: String? }
+struct LatestHealthResponse: Codable {
+    let sleep: SleepData?; let heartRate: HeartRateData?; let restingHeartRate: RestingHRData?
+    let hrv: HRVData?; let steps: StepsData?; let activeEnergy: EnergyData?
+}
+struct SleepData: Codable { let totalSleep: Double?; let deep: Double?; let rem: Double?; let core: Double? }
+struct HeartRateData: Codable { let avg: Int?; let min: Int?; let max: Int? }
+struct RestingHRData: Codable { let value: Double? }
+struct HRVData: Codable { let avg: Double?; let latest: Double? }
+struct StepsData: Codable { let total: Int? }
+struct EnergyData: Codable { let total: Int?; let units: String? }