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/User.php

@@ -16,6 +16,8 @@ class User extends Authenticatable
     /** @use HasFactory<UserFactory> */
     use HasApiTokens, HasFactory, Notifiable;
 
+    protected $table = 'users';
+
     protected $fillable = [
         'name',
         'email',
@@ -41,12 +43,12 @@ class User extends Authenticatable
 
     public function roles(): BelongsToMany
     {
-        return $this->belongsToMany(Role::class);
+        return $this->belongsToMany(Role::class, 'role_user');
     }
 
     public function projects(): BelongsToMany
     {
-        return $this->belongsToMany(Project::class)
+        return $this->belongsToMany(Project::class, 'project_user')
             ->withPivot('rol')
             ->withTimestamps()
             ->using(ProjectUser::class);