feat: add Google Sign-In to login and register pages

- Add GoogleOAuthProvider wrapper in layout.tsx
- Add Google login button to LoginForm with "or continue with email" separator
- Add Google signup button to RegisterForm
- Add Google auth types and API client integration
- Add GOOGLE_CLIENT_ID and NEXT_PUBLIC_GOOGLE_CLIENT_ID to env config
- Add translations (EN/FR) for Google OAuth UI
- Backend already has /api/v1/auth/google endpoint, no changes needed

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

docker-compose.yml

@@ -71,7 +71,7 @@ services:
     container_name: wordly-backend
     restart: unless-stopped
     ports:
-      - "8000:8000"
+      - "8001:8000"
     env_file:
       - .env
     environment:
@@ -104,6 +104,7 @@ services:
       - STRIPE_STARTER_PRICE_ID=${STRIPE_STARTER_PRICE_ID:-}
       - STRIPE_PRO_PRICE_ID=${STRIPE_PRO_PRICE_ID:-}
       - STRIPE_BUSINESS_PRICE_ID=${STRIPE_BUSINESS_PRICE_ID:-}
+      - GOOGLE_CLIENT_ID=${GOOGLE_CLIENT_ID:-}
     volumes:
       - uploads_data:/app/uploads
       - outputs_data:/app/outputs
@@ -146,7 +147,7 @@ services:
       - .env
     environment:
       - NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL:-https://wordly.art}
-    networks:
+      - NEXT_PUBLIC_GOOGLE_CLIENT_ID=${NEXT_PUBLIC_GOOGLE_CLIENT_ID:-}
       - wordly-network
     depends_on:
       backend: