Add mobile services, web proxy, and Gemma4 agent loop

- Mobile: add push notification and calendar sync services with full test suite (calendar, eventStore, notifications,
  screens)
- Mobile: add EAS build config and Jest setup
- Web: add API proxy, update useDestinationStation/useJourneys hooks, add middleware tests
- Web: update next.config and rebuild
- Agent: add Gemma4-based agent loop (agent_base, ttl_agent, ts_agent)
- Docs: add privacy policy, post-MVP plan, and aider rules

.env.example

@@ -15,3 +15,9 @@ NOMINATIM_USER_AGENT=OebbPlanner/1.0
 
 # Wiener Linien Open Data API
 WIENER_LINIEN_API_URL=https://api.wienerlinien.at/darwin-v2
+
+# CORS Configuration
+CORS_ALLOWED_ORIGINS=http://localhost:3000,http://localhost:3001,https://timetoleave.app
+
+# Deployment URL
+DEPLOYMENT_URL=https://timetoleave.app