feat: initialize project with Docker, PostgreSQL, Redis, and Vue.js frontend

- Added docker-compose.yml for PostgreSQL and Redis services with health checks.
- Created frontend directory with initial Vue.js setup including package.json, vite.config.ts, and TypeScript configuration.
- Implemented main application structure with App.vue and HomePage.vue components.
- Added message fetching and posting functionality in HomePage.vue.
- Included necessary styles and scripts for Ionic framework integration.
- Developed a dev-stack script to manage Docker containers and run backend/frontend servers.

backend/.env.example

@@ -0,0 +1,4 @@
+DATABASE_URL="postgresql://USER:PASSWORD@localhost:5432/xip"
+REDIS_URL="redis://localhost:6379"
+PORT=3000
+NODE_ENV=development