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>

app/Http/Resources/DropOffCapacityLogResource.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Http\Resources;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+class DropOffCapacityLogResource extends JsonResource
+{
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'recorded_at' => $this->recorded_at?->toIso8601String(),
+            'fill_percent' => $this->fill_percent,
+            'notes' => $this->notes,
+            'recorded_by' => $this->whenLoaded('recordedBy', fn () => [
+                'id' => $this->recordedBy?->uuid,
+                'name' => $this->recordedBy?->full_name,
+            ]),
+        ];
+    }
+}