feat: Implement Slack, Trello, and Courier (ShipLogic) integration

- Add 14 domain events for order lifecycle (OrderCreated, OrderPacked, ShipmentCreated, ParcelDelivered, etc.)
- Create SlackNotifierService with channels for orders, design, production, shipping, ops-alerts
- Create TrelloService to create cards, move cards between lists, attach files, check items
- Create CourierService to integrate with ShipLogic API for shipment creation and document retrieval
- Create PackingController to explicitly capture packing dimensions and weight
- Create ShippingController with multi-layer guards: packing validation, payment/approval verification, idempotency
- Create TrelloWebhookController to handle incoming Trello webhooks as intent signals
- Create CourierWebhookController to handle Shiplogic status updates
- Create event listeners for Slack notifications and Trello card updates
- Create EventServiceProvider to register all events and listeners
- Add database migration for packing, courier, and Trello data columns
- Create config files for slack, trello, and courier integration
- Update .env with integration secrets placeholders
- Add routes for /orders/{id}/pack, /orders/{id}/ship, /api/webhooks/trello, /api/webhooks/courier

Key architectural decisions:
- Packing is explicit ops action (not automatic from status)
- Shipment creation only after: Trello intent + packing confirmed + payment/approval rules met
- Courier API failures keep order in Ready to Ship state (safe retry)
- Trello and Slack are mirrors of backend state, not decision makers
- All side effects flow through event listeners, maintaining separation of concerns

app/Events/BalancePaid.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Events;
+
+use App\Models\Order;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class BalancePaid
+{
+    use Dispatchable, SerializesModels;
+
+    public function __construct(
+        public Order $order,
+        public float $balanceAmount,
+    ) {
+    }
+}

app/Events/DepositPaid.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Events;
+
+use App\Models\Order;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class DepositPaid
+{
+    use Dispatchable, SerializesModels;
+
+    public function __construct(
+        public Order $order,
+        public float $depositAmount,
+    ) {
+    }
+}

app/Events/OrderCreated.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Events;
+
+use App\Models\Order;
+use Illuminate\Broadcasting\Channel;
+use Illuminate\Broadcasting\InteractsWithSockets;
+use Illuminate\Broadcasting\PrivateChannel;
+use Illuminate\Contracts\Broadcasting\ShouldBroadcast;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class OrderCreated
+{
+    use Dispatchable, InteractsWithSockets, SerializesModels;
+
+    public function __construct(
+        public Order $order,
+        public string $orderType = 'standard', // 'standard' or 'custom'
+    ) {
+    }
+
+    public function broadcastOn(): array
+    {
+        return [
+            new PrivateChannel('channel-name'),
+        ];
+    }
+}

app/Events/OrderPacked.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Events;
+
+use App\Models\Order;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class OrderPacked
+{
+    use Dispatchable, SerializesModels;
+
+    public function __construct(
+        public Order $order,
+        public float $width,
+        public float $length,
+        public float $weight,
+        public ?int $packedBy = null,
+    ) {
+    }
+}

app/Events/ParcelCollected.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Events;
+
+use App\Models\Order;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class ParcelCollected
+{
+    use Dispatchable, SerializesModels;
+
+    public function __construct(
+        public Order $order,
+        public string $waybillId,
+    ) {
+    }
+}

app/Events/ParcelDelivered.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Events;
+
+use App\Models\Order;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class ParcelDelivered
+{
+    use Dispatchable, SerializesModels;
+
+    public function __construct(
+        public Order $order,
+        public string $waybillId,
+    ) {
+    }
+}

app/Events/ParcelFailedDelivery.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace App\Events;
+
+use App\Models\Order;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class ParcelFailedDelivery
+{
+    use Dispatchable, SerializesModels;
+
+    public function __construct(
+        public Order $order,
+        public string $waybillId,
+        public string $failureReason = '',
+    ) {
+    }
+}

app/Events/ParcelInTransit.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Events;
+
+use App\Models\Order;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class ParcelInTransit
+{
+    use Dispatchable, SerializesModels;
+
+    public function __construct(
+        public Order $order,
+        public string $waybillId,
+    ) {
+    }
+}

app/Events/ProofApproved.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Events;
+
+use App\Models\CustomOrder;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class ProofApproved
+{
+    use Dispatchable, SerializesModels;
+
+    public function __construct(
+        public CustomOrder $customOrder,
+    ) {
+    }
+}

app/Events/ProofRevisionRequested.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Events;
+
+use App\Models\CustomOrder;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class ProofRevisionRequested
+{
+    use Dispatchable, SerializesModels;
+
+    public function __construct(
+        public CustomOrder $customOrder,
+        public string $revisionNotes = '',
+    ) {
+    }
+}

app/Events/ProofUploaded.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Events;
+
+use App\Models\CustomOrder;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class ProofUploaded
+{
+    use Dispatchable, SerializesModels;
+
+    public function __construct(
+        public CustomOrder $customOrder,
+        public string $proofFilePath,
+    ) {
+    }
+}

app/Events/ReadyToShipIntent.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Events;
+
+use App\Models\Order;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class ReadyToShipIntent
+{
+    use Dispatchable, SerializesModels;
+
+    public function __construct(
+        public Order $order,
+        public ?string $trelloCardId = null,
+    ) {
+    }
+}

app/Events/ShipmentCreated.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Events;
+
+use App\Models\Order;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class ShipmentCreated
+{
+    use Dispatchable, SerializesModels;
+
+    public function __construct(
+        public Order $order,
+        public string $waybillId,
+        public string $trackingNumber,
+        public ?string $stickerPath = null,
+        public ?string $waybillPath = null,
+    ) {
+    }
+}

app/Events/ShipmentCreationFailed.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Events;
+
+use App\Models\Order;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Queue\SerializesModels;
+
+class ShipmentCreationFailed
+{
+    use Dispatchable, SerializesModels;
+
+    public function __construct(
+        public Order $order,
+        public string $errorMessage,
+    ) {
+    }
+}