feat(form-builder): form_field_configs relational table + non-validation key split + drop validation_rules JSON columns

api/app/Models/FormBuilder/FormFieldConfig.php

@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Models\FormBuilder;
+
+use App\Enums\FormBuilder\FormFieldConfigType;
+use App\Models\Scopes\FormFieldConfigScope;
+use Illuminate\Database\Eloquent\Concerns\HasUlids;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\MorphTo;
+
+/**
+ * Relational home for non-validation field configuration. See
+ * ARCH-FORM-BUILDER §17.5 and ARCH-CONSOLIDATION-ADDENDUM-2026-04-24
+ * §Q3 WS-5b Uitvoering.
+ *
+ * Polymorphic owner (`form_field` / `form_field_library` aliases, reused
+ * from WS-5a). One row per (owner, config_type). Parameter shape
+ * validated at the service layer.
+ */
+final class FormFieldConfig extends Model
+{
+    use HasFactory;
+    use HasUlids;
+
+    protected $table = 'form_field_configs';
+
+    protected static function booted(): void
+    {
+        static::addGlobalScope(new FormFieldConfigScope());
+    }
+
+    protected $fillable = [
+        'owner_type',
+        'owner_id',
+        'config_type',
+        'parameters',
+    ];
+
+    /** @var array<string, string> */
+    protected $casts = [
+        'config_type' => FormFieldConfigType::class,
+        'parameters' => 'array',
+    ];
+
+    public function owner(): MorphTo
+    {
+        return $this->morphTo('owner', 'owner_type', 'owner_id');
+    }
+}