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/Models/DropOffPoint.php

@@ -0,0 +1,76 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\SoftDeletes;
+use Illuminate\Support\Str;
+use MatanYadaev\EloquentSpatial\Objects\Point;
+use MatanYadaev\EloquentSpatial\Traits\HasSpatial;
+
+class DropOffPoint extends Model
+{
+    use HasFactory, HasSpatial, SoftDeletes;
+
+    public const STATUS_ACTIVE = 'active';
+    public const STATUS_MAINTENANCE = 'maintenance';
+    public const STATUS_CLOSED = 'closed';
+
+    protected $fillable = [
+        'uuid',
+        'name',
+        'code',
+        'barangay_id',
+        'coordinates',
+        'address_line',
+        'capacity_kg',
+        'operating_hours',
+        'accepted_waste_types',
+        'status',
+        'photo_path',
+        'contact_person',
+        'contact_phone',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'coordinates' => Point::class,
+            'operating_hours' => 'array',
+            'accepted_waste_types' => 'array',
+            'capacity_kg' => 'integer',
+        ];
+    }
+
+    public function getRouteKeyName(): string
+    {
+        return 'uuid';
+    }
+
+    protected static function booted(): void
+    {
+        static::creating(function (self $dop): void {
+            if (empty($dop->uuid)) {
+                $dop->uuid = (string) Str::uuid();
+            }
+        });
+    }
+
+    public function barangay(): BelongsTo
+    {
+        return $this->belongsTo(Barangay::class);
+    }
+
+    public function capacityLogs(): HasMany
+    {
+        return $this->hasMany(DropOffCapacityLog::class);
+    }
+
+    public function households(): HasMany
+    {
+        return $this->hasMany(Household::class, 'assigned_drop_off_point_id');
+    }
+}