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/Fase.php

@@ -10,6 +10,7 @@ use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class Fase extends Model
 {
+    protected $table = 'fases';
     protected $fillable = [
         'project_id',
         'type',