feat: resolve outcodes from local DB before HTTP

tests/Unit/Services/PostcodeServiceTest.php

@@ -1,5 +1,6 @@
 <?php
 
+use App\Models\Outcode;
 use App\Models\Postcode;
 use App\Services\ApiLogger;
 use App\Services\LocationResult;
@@ -194,3 +195,24 @@ it('resolves a full postcode from local DB without calling HTTP', function (): v
 
     Http::assertNothingSent();
 });
+
+// --- Local DB (outcode) ---
+
+it('resolves an outcode from local DB without calling HTTP', function (): void {
+    Outcode::create([
+        'outcode' => 'PE7',
+        'lat' => 52.536397,
+        'lng' => -0.210181,
+    ]);
+
+    Http::fake();
+
+    $result = $this->service->resolve('PE7');
+
+    expect($result)->toBeInstanceOf(LocationResult::class)
+        ->and($result->displayName)->toBe('PE7')
+        ->and($result->lat)->toBe(52.536397)
+        ->and($result->lng)->toBe(-0.210181);
+
+    Http::assertNothingSent();
+});