Remove prediction API endpoint and integrate into stations search

Consolidate prediction functionality by merging /api/prediction endpoint into /api/stations response. Move prediction logic from PredictionController into StationController, returning prediction data alongside station results. Replace usePrediction composable with unified useStations that returns {stations, meta, prediction}. Remove PredictionRequest, related tests, and unused Vue components (FuelFinderTest, MapTest, RecommendationTest, StationListTest). Add PredictionFull component and UpsellBanner. Extend NationalFuelPredictionService to include weekly_summary (7-day series, yesterday/today averages, cheapest/priciest days) and oil signal from price_predictions table. Update Home.vue to consume prediction from stations response. Add Plan::resolveCadenceForUser helper and configure Cashier to use custom Subscription model.

tests/Feature/Api/StationControllerTest.php

@@ -1,8 +1,10 @@
 <?php
 
 use App\Enums\FuelType;
+use App\Filament\Resources\UserResource;
 use App\Models\Station;
 use App\Models\StationPriceCurrent;
+use App\Models\User;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Illuminate\Support\Facades\Http;
 
@@ -12,6 +14,15 @@ beforeEach(function () {
     $this->withHeaders(['X-Api-Key' => config('app.api_secret_key')]);
 });
 
+function asPaidUserOnStations(string $tier = 'plus'): User
+{
+    test()->artisan('db:seed', ['--class' => 'PlanSeeder']);
+    $user = User::factory()->create();
+    UserResource::applyTier($user, $tier, 'monthly');
+
+    return $user;
+}
+
 it('returns stations near coordinates filtered by fuel type', function () {
     $station = Station::factory()->create(['lat' => 52.555064, 'lng' => -0.256119]);
     StationPriceCurrent::factory()->create([
@@ -192,3 +203,37 @@ it('includes resolved lat and lng in meta when postcode is provided', function (
         ->assertJsonPath('meta.lat', 51.5010)
         ->assertJsonPath('meta.lng', -0.1415);
 });
+
+it('embeds a tier-locked prediction teaser for guest requests', function () {
+    Station::factory()->create(['lat' => 52.555, 'lng' => -0.256]);
+
+    $this->getJson('/api/stations?lat=52.555&lng=-0.256&fuel_type=e10&radius=10')
+        ->assertOk()
+        ->assertJsonPath('prediction.tier_locked', true)
+        ->assertJsonStructure(['prediction' => ['fuel_type', 'predicted_direction', 'tier_locked']])
+        ->assertJsonMissingPath('prediction.signals')
+        ->assertJsonMissingPath('prediction.weekly_summary');
+});
+
+it('embeds a tier-locked teaser for free-tier authenticated users', function () {
+    asPaidUserOnStations('free');
+    $user = User::query()->latest('id')->first();
+    Station::factory()->create(['lat' => 52.555, 'lng' => -0.256]);
+
+    $this->actingAs($user, 'sanctum')
+        ->getJson('/api/stations?lat=52.555&lng=-0.256&fuel_type=e10&radius=10')
+        ->assertOk()
+        ->assertJsonPath('prediction.tier_locked', true)
+        ->assertJsonMissingPath('prediction.signals');
+});
+
+it('embeds the full prediction payload for plus users', function () {
+    $user = asPaidUserOnStations('plus');
+    Station::factory()->create(['lat' => 52.555, 'lng' => -0.256]);
+
+    $this->actingAs($user, 'sanctum')
+        ->getJson('/api/stations?lat=52.555&lng=-0.256&fuel_type=e10&radius=10')
+        ->assertOk()
+        ->assertJsonStructure(['prediction' => ['fuel_type', 'predicted_direction', 'confidence_score', 'reasoning', 'weekly_summary', 'signals']])
+        ->assertJsonMissingPath('prediction.tier_locked');
+});