Rebrand from "Fuel Price" to "Fuel Alert" and update project metadata

- Rename project in package.json, composer.json, and .env.example
- Update app name, URLs, and session domains to fuel-alert
- Comment out testimonials section in Home.vue
- Revise footer copy: remove "

docs/api-reference.md

@@ -1,6 +1,6 @@
 # FuelAlert API Reference
 
-Base URL: `https://fuel-price.test/api`  
+Base URL: `https://fuel-alert.test/api`  
 All endpoints return JSON. All endpoints require an `X-Api-Key` header.
 
 **Authentication:**