feat: app mobile React Native / Expo (v0.31.0)

Package mobile/ (Expo SDK 56, expo-router) réutilisant l'API backend :
Login (mdp+TOTP), Chat (+ TTS expo-speech), Review (approuver/refuser).
JWT en expo-secure-store, thème dark HUD, EXPO_PUBLIC_API_BASE. typecheck
vert. STT mobile reporté (lib native), TTS OK. Versions gérées par Expo.

Palier de risque : reversible (client mobile, API commune).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

mobile/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "chlova-mobile",
+  "version": "0.1.0",
+  "private": true,
+  "main": "expo-router/entry",
+  "description": "CHLOVA — app mobile (React Native / Expo), client du backend",
+  "scripts": {
+    "start": "expo start",
+    "android": "expo start --android",
+    "ios": "expo start --ios",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "@expo/vector-icons": "^15.0.2",
+    "expo": "56.0.12",
+    "expo-constants": "~56.0.18",
+    "expo-linking": "~56.0.14",
+    "expo-router": "~56.2.11",
+    "expo-secure-store": "~56.0.4",
+    "expo-speech": "~56.0.3",
+    "expo-status-bar": "~56.0.4",
+    "react": "19.2.7",
+    "react-native": "0.86.0",
+    "react-native-safe-area-context": "~5.7.0",
+    "react-native-screens": "4.25.2"
+  },
+  "devDependencies": {
+    "@types/react": "19.2.17",
+    "typescript": "5.7.3"
+  }
+}