feat: add legal opinions admin management

app/Models/LegalOpinionCategory.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class LegalOpinionCategory extends Model
+{
+    use HasFactory;
+
+    protected $fillable = ['name'];
+
+    public function legalOpinions()
+    {
+        return $this->hasMany(LegalOpinion::class, 'category_id');
+    }
+}