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/Plan.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace App\Models;
+
+use App\Enums\PlanTier;
+use Database\Factories\PlanFactory;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Support\Facades\Cache;
+
+class Plan extends Model
+{
+    /** @use HasFactory<PlanFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'name',
+        'stripe_price_id',
+        'features',
+        'active',
+    ];
+
+    /**
+     * Resolve the active plan for a user.
+     * Falls back to the free plan when no active Cashier subscription exists.
+     */
+    public static function resolveForUser(User $user): self
+    {
+        $cache = Cache::supportsTags() ? Cache::tags(['plans']) : Cache::store();
+
+        return $cache->remember(
+            "plan_for_user_{$user->id}",
+            3600,
+            function () use ($user): self {
+                $priceId = null;
+
+                if (method_exists($user, 'subscriptions')) {
+                    $subscription = $user->subscriptions()->active()->first();
+                    $priceId = $subscription?->stripe_price ?? null;
+                }
+
+                if ($priceId) {
+                    $plan = static::where('stripe_price_id', $priceId)->where('active', true)->first();
+
+                    if ($plan) {
+                        return $plan;
+                    }
+                }
+
+                return static::where('name', PlanTier::Free->value)->firstOrFail();
+            }
+        );
+    }
+
+    protected static function booted(): void
+    {
+        static::saved(function (): void {
+            if (Cache::supportsTags()) {
+                Cache::tags(['plans'])->flush();
+            }
+        });
+    }
+
+    protected function casts(): array
+    {
+        return [
+            'features' => 'array',
+            'active' => 'boolean',
+        ];
+    }
+}