feat: complete saleor core extensions app with React email templates

- Order confirmation, shipped, and cancelled email templates
- Uses @react-email/components for professional HTML emails
- Sends admin and customer notifications
- Integrates with Resend for email delivery
- Webhook handlers for ORDER_CREATED, ORDER_FULFILLED, ORDER_CANCELLED
- Docker image optimized for production
- Persistent auth data storage via PVC

graphql/fragments/order-cancelled.graphql

@@ -0,0 +1,13 @@
+fragment OrderCancelledWebhookPayload on OrderCancelled {
+  order {
+    id
+    number
+    userEmail
+    user {
+      email
+      firstName
+      lastName
+    }
+    status
+  }
+}

graphql/fragments/order-created.graphql

@@ -0,0 +1,86 @@
+fragment OrderCreatedWebhookPayload on OrderCreated {
+  order {
+    id
+    number
+    created
+    status
+    userEmail
+    languageCode
+    channel {
+      slug
+    }
+    user {
+      email
+      firstName
+      lastName
+    }
+    shippingAddress {
+      firstName
+      lastName
+      streetAddress1
+      streetAddress2
+      city
+      postalCode
+      country {
+        country
+      }
+      phone
+    }
+    billingAddress {
+      firstName
+      lastName
+      streetAddress1
+      streetAddress2
+      city
+      postalCode
+      country {
+        country
+      }
+      phone
+    }
+    lines {
+      id
+      quantity
+      unitPrice {
+        gross {
+          amount
+          currency
+        }
+      }
+      totalPrice {
+        gross {
+          amount
+          currency
+        }
+      }
+      variant {
+        name
+        sku
+        product {
+          name
+          media {
+            url
+          }
+        }
+      }
+    }
+    subtotal {
+      gross {
+        amount
+        currency
+      }
+    }
+    shippingPrice {
+      gross {
+        amount
+        currency
+      }
+    }
+    total {
+      gross {
+        amount
+        currency
+      }
+    }
+  }
+}

graphql/fragments/order-filter-shipping-methods.graphql

@@ -0,0 +1,9 @@
+fragment OrderFilterShippingMethodsPayload on OrderFilterShippingMethods {
+  order {
+    id
+  }
+  shippingMethods {
+    id
+    name
+  }
+}

graphql/fragments/order-fulfilled.graphql

@@ -0,0 +1,18 @@
+fragment OrderFulfilledWebhookPayload on OrderFulfilled {
+  order {
+    id
+    number
+    userEmail
+    user {
+      email
+      firstName
+      lastName
+    }
+    status
+    fulfillments {
+      id
+      status
+      created
+    }
+  }
+}

graphql/queries/last-order.graphql

@@ -0,0 +1,29 @@
+query LastOrder {
+  orders(first: 1) {
+    edges {
+      node {
+        id
+        number
+        created
+        user {
+          firstName
+          lastName
+        }
+        shippingAddress {
+          country {
+            country
+          }
+        }
+        total {
+          gross {
+            amount
+            currency
+          }
+        }
+        lines {
+          id
+        }
+      }
+    }
+  }
+}

graphql/queries/product.graphql

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+query ProductTimestamps($id: ID) {
+    product(id: $id) {
+        created
+        updatedAt
+    }
+}

graphql/subscriptions/order-cancelled.graphql

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+subscription OrderCancelledSubscription {
+  event {
+    ...OrderCancelledWebhookPayload
+  }
+}

graphql/subscriptions/order-created.graphql

@@ -0,0 +1,5 @@
+subscription OrderCreatedSubscription {
+  event {
+    ...OrderCreatedWebhookPayload
+  }
+}

graphql/subscriptions/order-filter-shipping-methods.graphql

@@ -0,0 +1,5 @@
+subscription OrderFilterShippingMethodsSubscription {
+  event {
+    ...OrderFilterShippingMethodsPayload
+  }
+}

graphql/subscriptions/order-fulfilled.graphql

@@ -0,0 +1,5 @@
+subscription OrderFulfilledSubscription {
+  event {
+    ...OrderFulfilledWebhookPayload
+  }
+}