Add configurable KiCad field export for part parameters

Add a kicad_export checkbox to parameters, allowing users to control
which specifications appear as fields in the KiCad HTTP library API.
Parameters with kicad_export enabled are included using their formatted
value, without overwriting hardcoded fields like description or Stock.

migrations/Version20260208190000.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use App\Migration\AbstractMultiPlatformMigration;
+use Doctrine\DBAL\Schema\Schema;
+
+final class Version20260208190000 extends AbstractMultiPlatformMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add kicad_export boolean column to parameters table';
+    }
+
+    public function mySQLUp(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE parameters ADD kicad_export TINYINT(1) NOT NULL DEFAULT 0');
+    }
+
+    public function mySQLDown(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE parameters DROP COLUMN kicad_export');
+    }
+
+    public function sqLiteUp(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE parameters ADD COLUMN kicad_export BOOLEAN NOT NULL DEFAULT 0');
+    }
+
+    public function sqLiteDown(Schema $schema): void
+    {
+        // SQLite does not support DROP COLUMN in older versions; recreate table if needed
+        $this->addSql('ALTER TABLE parameters DROP COLUMN kicad_export');
+    }
+
+    public function postgreSQLUp(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE parameters ADD kicad_export BOOLEAN NOT NULL DEFAULT FALSE');
+    }
+
+    public function postgreSQLDown(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE parameters DROP COLUMN kicad_export');
+    }
+}