Add tier feature design spec, annual billing, fuel type normalization, and admin subscription management

- Add comprehensive tier feature matrix spec defining Free/Basic/Plus/Pro capabilities across recommendations, predictions, history, logs, tools, and family sharing
- Add `stripe_price_id_annual` column to plans table and rename existing column to `stripe_price_id_monthly`
- Normalize legacy fuel type aliases (petrol→e10, diesel→b7_standard) in users table
- Implement BillingController with checkout, portal, success/cancel routes supporting monthly/annual cadence
- Add admin subscription assignment in Filament user edit page with admin-granted subscription support
- Add DowngradeUserOnSubscriptionDeleted listener to disable WhatsApp/SMS preferences on subscription cancellation
- Add MissedNotificationsOverview widget to Filament user detail page
- Add PollFuelPricesTest covering auto-refresh scenarios
- Add PriceReliability enum with reliability classification based on price age
- Add fuelTypes.js constants file exporting FUEL_TYPES from window global

tests/Feature/Console/PollFuelPricesTest.php

@@ -0,0 +1,120 @@
+<?php
+
+use App\Models\Station;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Cache;
+use Illuminate\Support\Facades\Http;
+
+uses(RefreshDatabase::class);
+
+beforeEach(function (): void {
+    Cache::put('fuel_finder_access_token', 'tok', 3540);
+});
+
+it('auto-refreshes station metadata when the stations table is empty', function (): void {
+    Http::fake([
+        '*/pfs?*' => Http::sequence()
+            ->push([[
+                'node_id' => 'sta1',
+                'trading_name' => 'Village Garage',
+                'brand_name' => 'Village Garage',
+                'is_same_trading_and_brand_name' => true,
+                'is_motorway_service_station' => false,
+                'is_supermarket_service_station' => false,
+                'temporary_closure' => false,
+                'permanent_closure' => false,
+                'permanent_closure_date' => null,
+                'public_phone_number' => null,
+                'location' => [
+                    'address_line_1' => '1 High Street',
+                    'address_line_2' => null,
+                    'city' => 'London',
+                    'county' => null,
+                    'country' => 'England',
+                    'postcode' => 'SW1A 1AA',
+                    'latitude' => 51.5,
+                    'longitude' => -0.1,
+                ],
+                'amenities' => [],
+                'opening_times' => null,
+                'fuel_types' => ['E10'],
+            ]])
+            ->push([]),
+        '*/pfs/fuel-prices*' => Http::sequence()
+            ->push([[
+                'node_id' => 'sta1',
+                'fuel_prices' => [[
+                    'fuel_type' => 'E10',
+                    'price' => 142.9,
+                    'price_last_updated' => '2026-04-04T10:00:00.000Z',
+                    'price_change_effective_timestamp' => '2026-04-04T10:00:00.000Z',
+                ]],
+            ]])
+            ->push([]),
+    ]);
+
+    $this->artisan('fuel:poll')->assertSuccessful();
+
+    expect(Station::find('sta1'))->not->toBeNull();
+});
+
+it('auto-refreshes station metadata when the last refresh was yesterday', function (): void {
+    Station::factory()->create([
+        'node_id' => 'sta1',
+        'last_seen_at' => now()->subDay()->endOfDay(),
+    ]);
+
+    Http::fake([
+        '*/pfs?*' => Http::sequence()
+            ->push([[
+                'node_id' => 'sta1',
+                'trading_name' => 'Refreshed Name',
+                'brand_name' => 'Refreshed Name',
+                'is_same_trading_and_brand_name' => true,
+                'is_motorway_service_station' => false,
+                'is_supermarket_service_station' => false,
+                'temporary_closure' => false,
+                'permanent_closure' => false,
+                'permanent_closure_date' => null,
+                'public_phone_number' => null,
+                'location' => [
+                    'address_line_1' => '1 High Street',
+                    'address_line_2' => null,
+                    'city' => 'London',
+                    'county' => null,
+                    'country' => 'England',
+                    'postcode' => 'SW1A 1AA',
+                    'latitude' => 51.5,
+                    'longitude' => -0.1,
+                ],
+                'amenities' => [],
+                'opening_times' => null,
+                'fuel_types' => ['E10'],
+            ]])
+            ->push([]),
+        '*/pfs/fuel-prices*' => Http::sequence()
+            ->push([])
+            ->push([]),
+    ]);
+
+    $this->artisan('fuel:poll')->assertSuccessful();
+
+    expect(Station::find('sta1')->trading_name)->toBe('Refreshed Name');
+});
+
+it('skips the station metadata refresh when already refreshed today', function (): void {
+    Station::factory()->create([
+        'node_id' => 'sta1',
+        'last_seen_at' => now(),
+    ]);
+
+    Http::fake([
+        '*/pfs/fuel-prices*' => Http::sequence()
+            ->push([])
+            ->push([]),
+    ]);
+
+    $this->artisan('fuel:poll')->assertSuccessful();
+
+    Http::assertNotSent(fn ($request) => str_contains($request->url(), '/pfs?'));
+});