feat(health): expose getCharacteristics (DOB / sexe / groupe sanguin)

Nouvelle méthode CoachHealthRoutePlugin.getCharacteristics qui lit
les caractéristiques read-only depuis HealthKit :
- dateOfBirth (ISO8601 date)
- biologicalSex (male/female/other)
- bloodType (A+/A-/B+/B-/AB+/AB-/O+/O-)

Auth étendue : on demande aussi read sur dateOfBirth, biologicalSex
et bloodType en plus de workoutType + workoutRoute.

Utilisé côté web par la page Profil pour auto-remplir les champs
sans saisie manuelle (cf. /api/profile/healthkit-suggestions).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ios/App/App/CoachHealthRoute.swift

@@ -24,6 +24,7 @@ public class CoachHealthRoutePlugin: CAPPlugin, CAPBridgedPlugin {
         CAPPluginMethod(name: "isAvailable", returnType: CAPPluginReturnPromise),
         CAPPluginMethod(name: "requestAuthorization", returnType: CAPPluginReturnPromise),
         CAPPluginMethod(name: "getRoute", returnType: CAPPluginReturnPromise),
+        CAPPluginMethod(name: "getCharacteristics", returnType: CAPPluginReturnPromise),
     ]
 
     private lazy var store = HKHealthStore()
@@ -42,10 +43,14 @@ public class CoachHealthRoutePlugin: CAPPlugin, CAPBridgedPlugin {
             call.resolve(["granted": false, "reason": "HealthKit unavailable"])
             return
         }
-        let types: Set<HKObjectType> = [
+        var types: Set<HKObjectType> = [
             HKObjectType.workoutType(),
             HKSeriesType.workoutRoute(),
         ]
+        // Caractéristiques (DOB, sexe, groupe sanguin) — read-only depuis HK
+        if let dob = HKObjectType.characteristicType(forIdentifier: .dateOfBirth) { types.insert(dob) }
+        if let sex = HKObjectType.characteristicType(forIdentifier: .biologicalSex) { types.insert(sex) }
+        if let blood = HKObjectType.characteristicType(forIdentifier: .bloodType) { types.insert(blood) }
         store.requestAuthorization(toShare: nil, read: types) { ok, err in
             if let err = err {
                 call.resolve(["granted": false, "reason": err.localizedDescription])
@@ -55,6 +60,43 @@ public class CoachHealthRoutePlugin: CAPPlugin, CAPBridgedPlugin {
         }
     }
 
+    @objc func getCharacteristics(_ call: CAPPluginCall) {
+        guard HKHealthStore.isHealthDataAvailable() else {
+            call.resolve(["available": false, "reason": "HealthKit unavailable"])
+            return
+        }
+        var result: [String: Any] = ["available": true]
+
+        // Date de naissance
+        if let dob = try? store.dateOfBirthComponents() {
+            if let date = Calendar.current.date(from: dob) {
+                let fmt = ISO8601DateFormatter()
+                fmt.formatOptions = [.withFullDate]
+                result["dateOfBirth"] = fmt.string(from: date)
+            }
+        }
+        // Sexe biologique
+        if let bs = try? store.biologicalSex() {
+            switch bs.biologicalSex {
+            case .male: result["biologicalSex"] = "male"
+            case .female: result["biologicalSex"] = "female"
+            case .other: result["biologicalSex"] = "other"
+            default: break  // notSet
+            }
+        }
+        // Groupe sanguin
+        if let bt = try? store.bloodType() {
+            let map: [HKBloodType: String] = [
+                .aPositive: "A+", .aNegative: "A-",
+                .bPositive: "B+", .bNegative: "B-",
+                .abPositive: "AB+", .abNegative: "AB-",
+                .oPositive: "O+", .oNegative: "O-",
+            ]
+            if let s = map[bt.bloodType] { result["bloodType"] = s }
+        }
+        call.resolve(result)
+    }
+
     @objc func getRoute(_ call: CAPPluginCall) {
         guard HKHealthStore.isHealthDataAvailable() else {
             call.resolve(["available": false, "reason": "HealthKit unavailable", "route": []])