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/UserNotificationPreference.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace App\Models;
+
+use Database\Factories\UserNotificationPreferenceFactory;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class UserNotificationPreference extends Model
+{
+    /** @use HasFactory<UserNotificationPreferenceFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'user_id',
+        'channel',
+        'fuel_type',
+        'enabled',
+    ];
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function scopeEnabled(Builder $query): void
+    {
+        $query->where('enabled', true);
+    }
+
+    public function scopeForChannel(Builder $query, string $channel): void
+    {
+        $query->where('channel', $channel);
+    }
+
+    public function scopeForFuelType(Builder $query, string $fuelType): void
+    {
+        $query->where('fuel_type', $fuelType);
+    }
+
+    protected function casts(): array
+    {
+        return [
+            'enabled' => 'boolean',
+        ];
+    }
+}