create mission tables with factory and seeder

app/Models/Mission.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\MorphToMany;
+
+class Mission extends Model
+{
+    use HasFactory;
+
+    protected $guarded = [];
+
+    public function roadItems(): MorphToMany
+    {
+        return $this->morphedByMany(RoadItemsProject::class, 'missionable');
+    }
+
+    public function roadPatrols(): MorphToMany
+    {
+        return $this->morphedByMany(RoadPatrol::class, 'missionable');
+    }
+
+    public function roadObserveds(): MorphToMany
+    {
+        return $this->morphedByMany(RoadObserved::class, 'missionable');
+    }
+}