feat: add weekly_pump_prices migration for BEIS fuel price data

Created migration for storing UK weekly pump prices from BEIS publications.
Table uses Monday date as primary key and stores petrol/diesel pump prices,
duty, and VAT rates as integer pence or percentage values.

database/migrations/2026_05_01_112248_create_weekly_pump_prices_table.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('weekly_pump_prices', function (Blueprint $table) {
+            $table->date('date')->primary()->comment('Week starting (Monday) per BEIS publication');
+            $table->unsignedSmallInteger('ulsp_pence')->comment('Petrol pump price × 100');
+            $table->unsignedSmallInteger('ulsd_pence')->comment('Diesel pump price × 100');
+            $table->unsignedSmallInteger('ulsp_duty_pence')->comment('Petrol duty × 100');
+            $table->unsignedSmallInteger('ulsd_duty_pence')->comment('Diesel duty × 100');
+            $table->unsignedTinyInteger('ulsp_vat_pct')->comment('VAT %');
+            $table->unsignedTinyInteger('ulsd_vat_pct')->comment('VAT %');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('weekly_pump_prices');
+    }
+};