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

codegen.ts

@@ -0,0 +1,55 @@
+import { CodegenConfig } from "@graphql-codegen/cli";
+
+const config: CodegenConfig = {
+  schema: "./graphql/schema.graphql",
+  documents: ["./graphql/**/*.graphql"],
+  generates: {
+    "./generated/graphql.ts": {
+      plugins: [
+        {
+          add: {
+            content:
+              "type JSONValue = string | number | boolean | null | { [key: string]: JSONValue } | JSONValue[];",
+          },
+        },
+        "typescript",
+        "typescript-operations",
+        "urql-introspection",
+        {
+          "typescript-urql": {
+            documentVariablePrefix: "Untyped",
+            fragmentVariablePrefix: "Untyped",
+          },
+        },
+        "typed-document-node",
+      ],
+      config: {
+        dedupeFragments: true,
+        defaultScalarType: "unknown",
+        immutableTypes: true,
+        strictScalars: true,
+        skipTypename: true,
+        scalars: {
+          _Any: "unknown",
+          Date: "string",
+          DateTime: "string",
+          Decimal: "number",
+          Minute: "number",
+          GenericScalar: "JSONValue",
+          JSON: "JSONValue",
+          JSONString: "string",
+          Metadata: "Record<string, string>",
+          PositiveDecimal: "number",
+          Upload: "unknown",
+          UUID: "string",
+          WeightScalar: "number",
+          Day: "string",
+          Hour: "number",
+          PositiveInt: "number",
+        },
+      },
+    },
+  },
+};
+
+export default config;