Add full SEO optimization for Spanglish social and language events

- Add comprehensive metadata to root layout with Open Graph, Twitter cards
- Create dynamic sitemap.ts for all pages and events
- Create robots.ts with proper allow/disallow rules
- Add JSON-LD Event structured data to event detail pages
- Add page-specific metadata to events, community, contact, FAQ pages
- Add FAQ structured data schema
- Update footer with local SEO text for Asunción, Paraguay
- Add web manifest for mobile SEO
- Create 404 page with proper noindex
- Optimize image alt text and add lazy loading
- Add NEXT_PUBLIC_SITE_URL env variable
- Add about/ folder to gitignore

frontend/.env.example

@@ -1,11 +1,25 @@
 # Frontend port (dev/start)
 PORT=3002
 
+# Site URL (for SEO canonical URLs, sitemap, etc.)
+NEXT_PUBLIC_SITE_URL=https://spanglish.com.py
+
 # API URL (leave empty for same-origin proxy)
 NEXT_PUBLIC_API_URL=
 
+# Google OAuth (optional - leave empty to hide Google Sign-In button)
+# Get your Client ID from: https://console.cloud.google.com/apis/credentials
+# 1. Create a new OAuth 2.0 Client ID (Web application)
+# 2. Add authorized JavaScript origins: http://localhost:3002, https://yourdomain.com
+# 3. Add authorized redirect URIs: http://localhost:3002, https://yourdomain.com
+NEXT_PUBLIC_GOOGLE_CLIENT_ID=
+
 # Social Links (optional - leave empty to hide)
 NEXT_PUBLIC_WHATSAPP=+595991234567
 NEXT_PUBLIC_INSTAGRAM=spanglish_py
 NEXT_PUBLIC_EMAIL=hola@spanglish.com.py
 NEXT_PUBLIC_TELEGRAM=spanglish_py
+
+# Plausible Analytics (optional - leave empty to disable tracking)
+NEXT_PUBLIC_PLAUSIBLE_URL=https://analytics.azzamo.net
+NEXT_PUBLIC_PLAUSIBLE_DOMAIN=spanglishcommunity.com