feat: implement currency rates tracking with models, migrations and views

app/Http/Controllers/RateController.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\City;
+use App\Models\Rate;
+
+class RateController extends Controller
+{
+    public function __invoke()
+    {
+
+        $supportedCities = City::query()
+            ->whereIn('name', City::supportedCities())
+            ->get()
+            ->sortByDesc(fn ($city) => $city->name === 'sanaa')
+            ->values();
+
+        $rates = Rate::query()
+            ->with('currency', 'city')
+            ->orderBy('city_id', 'asc')
+            ->orderBy('currency_id', 'asc')
+            ->orderBy('date', 'desc')
+            ->get()
+            ->groupBy(fn ($rate) => $rate->city_id.'-'.$rate->currency_id)
+            ->map(fn ($group) => $group->first())
+            ->groupBy('city_id');
+
+        return view('rates', [
+            'rates' => $rates,
+            'supportedCities' => $supportedCities,
+        ]);
+    }
+}