feat(backend): complete Module 5 (drop-off points + auto-assign)

drop_off_points (with SPATIAL INDEX on coordinates) +
drop_off_capacity_logs. Public nearby query via ST_Distance_Sphere
returns DOPs sorted by distance with distance_meters in payload.
Admin CRUD plus capacity-log endpoint. Household creation auto-assigns
to the nearest active DOP within 25km; resident can re-run the lookup
via POST /households/{uuid}/reassign-drop-off.

97 feature tests passing.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

database/factories/DropOffPointFactory.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace Database\Factories;
+
+use App\Models\DropOffPoint;
+use Illuminate\Database\Eloquent\Factories\Factory;
+use Illuminate\Support\Str;
+use MatanYadaev\EloquentSpatial\Objects\Point;
+
+/**
+ * @extends \Illuminate\Database\Eloquent\Factories\Factory<\App\Models\DropOffPoint>
+ */
+class DropOffPointFactory extends Factory
+{
+    protected $model = DropOffPoint::class;
+
+    public function definition(): array
+    {
+        return [
+            'uuid' => (string) Str::uuid(),
+            'name' => fake()->company().' DOP',
+            'code' => 'DOP-'.strtoupper(Str::random(6)),
+            'coordinates' => new Point(14.6, 121.0, 4326),
+            'address_line' => fake()->streetAddress(),
+            'capacity_kg' => 1000,
+            'status' => DropOffPoint::STATUS_ACTIVE,
+        ];
+    }
+
+    public function at(float $lat, float $lng): static
+    {
+        return $this->state(fn () => [
+            'coordinates' => new Point($lat, $lng, 4326),
+        ]);
+    }
+}