Fix Dutch model table names and seeder status values

- Add explicit $table property to all Eloquent models with Dutch names
- Fix pivot table names in belongsToMany relationships
- Fix seeder: use valid enum values for afhankelijkheden status

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/Models/Role.php

@@ -7,6 +7,8 @@ use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 
 class Role extends Model
 {
+    protected $table = 'roles';
+
     protected $fillable = [
         'naam',
         'beschrijving',
@@ -22,6 +24,6 @@ class Role extends Model
 
     public function users(): BelongsToMany
     {
-        return $this->belongsToMany(User::class);
+        return $this->belongsToMany(User::class, 'role_user');
     }
 }