nonDbFakerStub on items with ref

[siggi-k]

Fix: FK faker detection, JSONB sub-property key derivation, and allOf handling

1. FK detection via attribute->reference instead of _id suffix (FakerStubResolver.php)

The _id-suffix heuristic generated invalid PHP for JSONB sub-properties with a $ref
(e.g. payment_method → payment_method_id, but attribute->reference was empty → \common\models\::find()).
Now uses !empty($this->attribute->reference) — set only when an actual $ref/allOf[$ref] resolves to a model.

Before (workaround — plain integer, no $ref, FK relation not expressed in spec):

payment_method_fields:
  type: object
  x-db-type: jsonb
  properties:
    payment_method_id:
      type: integer

After (correct — $ref used directly, key payment_method_id derived automatically):

payment_method_fields:
  type: object
  x-db-type: jsonb
  properties:
    payment_method:
      $ref: '../openapi.yaml#/components/schemas/CompanyPaymentMethod'

Also works with allOf (e.g. to add a description):

payment_method_fields:
  type: object
  x-db-type: jsonb
  properties:
    payment_method:
      allOf:
        - $ref: '../openapi.yaml#/components/schemas/CompanyPaymentMethod'
        - description: "Payment method used for this invoice"

2. New private resolveElement() — correct key derivation for JSONB sub-properties (FakerStubResolver.php)

fakeForObject() used the raw spec property name as key. FK sub-properties now go through
resolveElement(), which runs AttributeResolver → Attribute::asReference() — the same
_id suffix logic as for top-level FK columns. Returns both columnName and fakerStub.
aElementFaker() delegates to it.

Using the YAML from point 1, the generated faker code is:

$model->payment_method_fields = [
    'payment_method_id' => $faker->randomElement(\common\models\CompanyPaymentMethod::find()->select("id")->column()),
    // ...
];

3. fakeForObject depth default: 1 → 0; reindentArrayMapForObject line shift fixed (FakerStubResolver.php)

Default 1 caused wrong indentation for top-level object attributes. Now 0; fakeForArray
explicitly passes 1. reindentArrayMapForObject now shifts all continuation lines (not just
the first), and }, range(1, n) is written on one line.

4. allOf handling: elseif chain → independent if blocks (PropertySchema.php)

The elseif chain applied only the first matching optional attribute from an allOf entry.
Four independent if blocks now apply all present attributes in one pass.