Feature: Wire up carrier-agnostic shipping admin UI

Registers ShippingServiceProvider (carrier config, driver/fulfillment bindings, Rates page override) and wires the shipping admin surface into CorePlugin: dynamic carrier dropdown on Shipping Method create/edit, a "Create Shipment" order action resolved generically by carrier, and a Pickup Manifests page for carriers that support manifest batching.

src/Shipping/Extensions/ShippingMethodResourceExtension.php

@@ -0,0 +1,83 @@
+<?php
+
+namespace Modules\Core\Shipping\Extensions;
+
+use Filament\Forms\Components\Component;
+use Filament\Forms\Components\Concerns\HasChildComponents;
+use Filament\Forms\Components\Select;
+use Filament\Forms\Form;
+use Filament\Tables\Columns\TextColumn;
+use Filament\Tables\Table;
+use Lunar\Admin\Support\Extending\ResourceExtension;
+use Lunar\Shipping\Facades\Shipping;
+
+class ShippingMethodResourceExtension extends ResourceExtension
+{
+    public function extendForm(Form $form): Form
+    {
+        return $form->schema(
+            $this->replaceDriverField($form->getComponents())
+        );
+    }
+
+    public function extendTable(Table $table): Table
+    {
+        return $table->columns(
+            array_map(function ($column) {
+                if (method_exists($column, 'getName') && $column->getName() === 'driver') {
+                    return $this->driverColumn();
+                }
+
+                return $column;
+            }, $table->getColumns())
+        );
+    }
+
+    private function driverColumn(): TextColumn
+    {
+        return TextColumn::make('driver')
+            ->label('Type')
+            ->formatStateUsing(fn ($state) => $this->driverLabel($state));
+    }
+
+    private function driverLabel(string $key): string
+    {
+        $driver = collect(Shipping::getSupportedDrivers())->get($key);
+
+        return $driver?->name() ?? $key;
+    }
+
+    /**
+     * Recursively walk the form tree and replace the hardcoded driver
+     * Select (nested inside Section > Group) with one listing every
+     * registered driver, built-in or custom.
+     *
+     * @param  array<Component>  $components
+     * @return array<Component>
+     */
+    private function replaceDriverField(array $components): array
+    {
+        return array_map(function (Component $component) {
+            if (method_exists($component, 'getName') && $component->getName() === 'driver') {
+                return $this->driverSelect();
+            }
+
+            if (in_array(HasChildComponents::class, class_uses_recursive($component), true)) {
+                $component->schema(
+                    $this->replaceDriverField($component->getChildComponents())
+                );
+            }
+
+            return $component;
+        }, $components);
+    }
+
+    private function driverSelect(): Select
+    {
+        return Select::make('driver')
+            ->label('Type')
+            ->options(fn () => collect(Shipping::getSupportedDrivers())
+                ->mapWithKeys(fn ($driver, $key) => [$key => $driver->name()]))
+            ->default('flat-rate');
+    }
+}