feat: Apple Watch app + Paywall + Privacy Policy + rebranding

## Major Features
- Apple Watch companion app (6 phases complete)
  - WatchConnectivity iPhone ↔ Watch
  - HealthKit integration (HR, calories)
  - SwiftUI premium UI
  - 9 complication types
  - Always-On Display support

- Paywall screen with RevenueCat integration
- Privacy Policy screen
- App rebranding: tabatago → TabataFit
- Bundle ID: com.millianlmx.tabatafit

## Changes
- New: ios/TabataFit Watch App/ (complete Watch app)
- New: app/paywall.tsx (subscription UI)
- New: app/privacy.tsx (privacy policy)
- New: src/features/watch/ (Watch sync hooks)
- New: admin-web/ (admin dashboard)
- Updated: app.json, package.json (branding)
- Updated: profile.tsx (paywall + privacy links)
- Updated: i18n translations (EN/FR/DE/ES)
- New: app icon 1024x1024

## Watch App Files
- TabataFitWatchApp.swift (entry point)
- ContentView.swift (premium UI)
- HealthKitManager.swift (HR + calories)
- WatchSessionManager.swift (communication)
- Complications/ (WidgetKit)
- UserDefaults+Shared.swift (data sharing)

app.json

@@ -1,16 +1,17 @@
 {
   "expo": {
-    "name": "tabatago",
-    "slug": "tabatago",
+    "name": "TabataFit",
+    "slug": "tabatafit",
     "version": "1.0.0",
     "orientation": "portrait",
     "icon": "./assets/images/icon.png",
-    "scheme": "tabatago",
+    "scheme": "tabatafit",
     "userInterfaceStyle": "automatic",
     "newArchEnabled": true,
     "ios": {
       "supportsTablet": true,
-      "bundleIdentifier": "com.anonymous.tabatago"
+      "bundleIdentifier": "com.millianlmx.tabatafit",
+      "buildNumber": "1"
     },
     "android": {
       "adaptiveIcon": {
@@ -20,7 +21,8 @@
         "monochromeImage": "./assets/images/android-icon-monochrome.png"
       },
       "edgeToEdgeEnabled": true,
-      "predictiveBackGestureEnabled": false
+      "predictiveBackGestureEnabled": false,
+      "package": "com.millianlmx.tabatafit"
     },
     "web": {
       "output": "static",
@@ -41,7 +43,6 @@
         }
       ],
       "expo-video",
-      "expo-notifications",
       "expo-localization",
       "./plugins/withStoreKitConfig"
     ],