hotfix: replace ->change() with raw ALTER TABLE in nullable migration

[roncodes]

Problem

The migration 2026_04_20_000001_make_orchestrator_priority_nullable_on_orders_table shipped in the previous PR crashes on deployment with:

Unknown column type "tinyinteger" requested. Any Doctrine type that you use
has to be registered with \Doctrine\DBAL\Types\Type::addType().

Root Cause

Blueprint::change() delegates to Doctrine DBAL to introspect the existing column definition before rewriting it. Doctrine does not have a registered type mapping for MySQL's native TINYINT, so it throws the tinyinteger error when it tries to describe the column.

Fix

Replace the Blueprint::change() call with a raw DB::statement() ALTER TABLE that modifies the column directly:

// Before (broken)
Schema::table('orders', function (Blueprint $table) {
    $table->unsignedTinyInteger('orchestrator_priority')
          ->default(50)->nullable()->change();
});

// After (fixed)
DB::statement(
    'ALTER TABLE `orders` MODIFY COLUMN `orchestrator_priority` TINYINT UNSIGNED NULL DEFAULT 50'
);

This is fully portable across all MySQL/MariaDB versions supported by Fleetbase and has no dependency on Doctrine DBAL type mappings. The down() method is updated identically.

Files Changed

File	Change
server/migrations/2026_04_20_000001_make_orchestrator_priority_nullable_on_orders_table.php	Replaced Schema::table()->change() with DB::statement(ALTER TABLE …) in both up() and down()