Address PR review: rename to eda_visibility, merge migrations, API versioning

Changes based on jbtronics' review of PR #1241:

- Rename kicad_export -> eda_visibility (entities, forms, templates,
  translations, tests) with nullable bool for system default support
- Merge two database migrations into one (Version20260211000000)
- Rename createCachedJsonResponse -> createCacheableJsonResponse
- Change bool $apiV2 -> int $apiVersion with version validation
- EDA visibility field only shown for part parameters, not other entities
- PopulateKicadCommand: check alternative names of footprints/categories
- PopulateKicadCommand: support external JSON mapping file (--mapping-file)
- Ship default mappings JSON at contrib/kicad-populate/default_mappings.json
- Add system-wide defaultEdaVisibility setting in KiCadEDASettings
- Add KiCad HTTP Library v2 spec link in controller docs

src/Form/ParameterType.php

@@ -149,10 +149,13 @@ class ParameterType extends AbstractType
             ],
         ]);
 
-        $builder->add('kicad_export', CheckboxType::class, [
-            'label' => false,
-            'required' => false,
-        ]);
+        // Only show the EDA visibility field for part parameters, as it has no function for other entities
+        if ($options['data_class'] === PartParameter::class) {
+            $builder->add('eda_visibility', CheckboxType::class, [
+                'label' => false,
+                'required' => false,
+            ]);
+        }
     }
 
     public function finishView(FormView $view, FormInterface $form, array $options): void

src/Form/Part/OrderdetailType.php

@@ -79,9 +79,9 @@ class OrderdetailType extends AbstractType
             'label' => 'orderdetails.edit.prices_includes_vat',
         ]);
 
-        $builder->add('kicad_export', CheckboxType::class, [
+        $builder->add('eda_visibility', CheckboxType::class, [
             'required' => false,
-            'label' => 'orderdetails.edit.kicad_export',
+            'label' => 'orderdetails.edit.eda_visibility',
         ]);
 
         //Add pricedetails after we know the data, so we can set the default currency