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/Document.php

@@ -11,6 +11,8 @@ class Document extends Model
 {
     use SoftDeletes;
 
+    protected $table = 'documents';
+
     protected $fillable = [
         'project_id',
         'fase_id',
@@ -46,6 +48,6 @@ class Document extends Model
 
     public function tags(): BelongsToMany
     {
-        return $this->belongsToMany(Tag::class);
+        return $this->belongsToMany(Tag::class, 'document_tag');
     }
 }