Add subscription tiers, notification preferences, and logging infrastructure

- Add database migrations for plans, subscriptions, notification preferences, and notification log tables
- Implement DispatchUserNotificationJob to handle channel resolution, daily limits, and logging (sent/tier_restricted/daily_limit)
- Add SendScheduledWhatsAppJob for scheduled notification delivery
- Create PlanFeatures service to resolve tier capabilities, check daily limits, and validate fuel

app/Models/NotificationLog.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Models;
+
+use Database\Factories\NotificationLogFactory;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class NotificationLog extends Model
+{
+    /** @use HasFactory<NotificationLogFactory> */
+    use HasFactory;
+
+    public $timestamps = false;
+    protected $table = 'notification_log';
+    protected $fillable = [
+        'user_id',
+        'channel',
+        'trigger_type',
+        'fuel_type',
+        'price',
+        'sent',
+        'missed_reason',
+        'created_at',
+    ];
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    /** Count sent notifications for this channel today. */
+    public function scopeSentToday(Builder $query, string $channel): void
+    {
+        $query->where('channel', $channel)
+            ->where('sent', true)
+            ->whereDate('created_at', today());
+    }
+
+    /** Notifications that were not sent. */
+    public function scopeMissed(Builder $query): void
+    {
+        $query->where('sent', false);
+    }
+
+    protected function casts(): array
+    {
+        return [
+            'sent' => 'boolean',
+            'price' => 'decimal:3',
+            'created_at' => 'datetime',
+        ];
+    }
+}