feat(watchos): target CoachWatch (Phase 1) — app watchOS embarquée

- nouvelle target watchOS app CoachWatch (ch.hypnotruck.coach.watchkitapp), SwiftUI, SDK watchos
- entitlement HealthKit + Info.plist FR (NSHealthShare/UpdateUsageDescription) + WKBackgroundModes workout-processing
- "Embed Watch Content" + dépendance App -> CoachWatch (CoachWatch.app dans App.app/Watch)
- schemes partagés App + CoachWatch
- CoachWatchApp.swift + ContentView.swift minimaux

Build validé: target watchsimulator + embed dans App.app (iphonesimulator).

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

ios/App/CoachWatch/CoachWatch.entitlements

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.developer.healthkit</key>
+	<true/>
+	<key>com.apple.developer.healthkit.access</key>
+	<array/>
+</dict>
+</plist>

ios/App/CoachWatch/CoachWatchApp.swift

@@ -0,0 +1,10 @@
+import SwiftUI
+
+@main
+struct CoachWatchApp: App {
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+    }
+}

ios/App/CoachWatch/ContentView.swift

@@ -0,0 +1,20 @@
+import SwiftUI
+
+struct ContentView: View {
+    var body: some View {
+        VStack(spacing: 8) {
+            Image(systemName: "heart.fill")
+                .foregroundStyle(.red)
+            Text("Coach")
+                .font(.headline)
+            Text("Prêt")
+                .font(.caption)
+                .foregroundStyle(.secondary)
+        }
+        .padding()
+    }
+}
+
+#Preview {
+    ContentView()
+}

ios/App/CoachWatch/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleDisplayName</key>
+	<string>Coach</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>$(MARKETING_VERSION)</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+	<key>WKApplication</key>
+	<true/>
+	<key>WKBackgroundModes</key>
+	<array>
+		<string>workout-processing</string>
+	</array>
+	<key>NSHealthShareUsageDescription</key>
+	<string>Coach Hypnotruck lit ta fréquence cardiaque et tes calories pendant la séance pour les afficher en direct sur ton iPhone.</string>
+	<key>NSHealthUpdateUsageDescription</key>
+	<string>Coach Hypnotruck enregistre ta séance dans l'app Santé.</string>
+</dict>
+</plist>