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/Requests/DropOff/StoreDropOffPointRequest.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace App\Http\Requests\DropOff;
+
+use App\Models\DropOffPoint;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class StoreDropOffPointRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'name' => ['required', 'string', 'max:191'],
+            'code' => ['required', 'string', 'max:32', Rule::unique('drop_off_points', 'code')->whereNull('deleted_at')],
+            'barangay_id' => ['nullable', 'integer', 'exists:barangays,id'],
+            'lat' => ['required', 'numeric', 'between:-90,90'],
+            'lng' => ['required', 'numeric', 'between:-180,180'],
+            'address_line' => ['required', 'string', 'max:255'],
+            'capacity_kg' => ['nullable', 'integer', 'min:0'],
+            'operating_hours' => ['nullable', 'array'],
+            'accepted_waste_types' => ['nullable', 'array'],
+            'accepted_waste_types.*' => ['string', 'max:50'],
+            'status' => ['nullable', Rule::in([
+                DropOffPoint::STATUS_ACTIVE,
+                DropOffPoint::STATUS_MAINTENANCE,
+                DropOffPoint::STATUS_CLOSED,
+            ])],
+            'photo_path' => ['nullable', 'string', 'max:255'],
+            'contact_person' => ['nullable', 'string', 'max:191'],
+            'contact_phone' => ['nullable', 'string', 'max:32'],
+        ];
+    }
+}