Remove placeholders and finalize contact details for launch

- Replace all `[PLACEHOLDER]` entries across legal pages with actual values
- Update privacy policy with ICO registration status and service provider details (Ionos, Vonage, OneSignal)
- Finalize contact email as `hello@fuel-alert.co.uk` throughout legal pages and footer
- Update legal layout to use full landing nav with auth/guest actions
- Add Umami analytics script to main app layout
- Remove "Fleet" nav link from landing navigation
- Add feature test to enforce no placeholders and correct contact domain remain in legal pages

resources/js/components/landing/LandingNav.vue

@@ -12,7 +12,6 @@
                 <a class="hover:text-accent transition-colors" href="#how-it-works">How it works</a>
                 <a class="hover:text-accent transition-colors" href="#features">Why it works</a>
                 <a class="hover:text-accent transition-colors" href="#pricing">Pricing</a>
-                <a class="hover:text-accent transition-colors" href="#fleet">Fleet</a>
             </div>
 
             <div class="flex items-center gap-3 md:gap-5">