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.

resources/js/views/dashboard/settings/Security.vue

@@ -76,7 +76,7 @@
                     <!-- eslint-disable-next-line vue/no-v-html -->
                     <div v-html="setupData.svg" class="[&_svg]:w-40 [&_svg]:h-40"></div>
                     <div class="space-y-1">
-                        <p class="text-xs font-bold text-zinc-500 uppercase tracking-widest">Or enter setup key manually</p>
+                        <p class="font-mono text-[10px] uppercase tracking-widest text-zinc-500 mb-1 truncate">Or enter setup key manually</p>
                         <code class="text-xs bg-zinc-50 px-3 py-2 rounded-lg font-mono text-zinc-800 break-all block">{{ setupData.secretKey }}</code>
                     </div>
                 </div>