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

.cursor/mcp.json

@@ -0,0 +1,11 @@
+{
+  "mcpServers": {
+    "mcp-saleor": {
+      "command": "npx",
+      "args": ["mcp-graphql"],
+      "env": {
+        "SCHEMA":"../graphql/schema.graphql"
+      }
+    }
+  }
+}

.cursor/rules/integrating-with-saleor-api.mdc

@@ -0,0 +1,17 @@
+---
+description: Integrating with Saleor API
+globs: 
+alwaysApply: false
+---
+
+# Verify Schema
+
+Whenever the user is asking for integration with Saleor API, verify the [schema.graphql](mdc:graphql/schema.graphql) to match the queries, mutations and inputs required by Saleor API.
+
+# GraphQL Files
+
+Whenever the user requires some GraphQL query/mutation, write them to a .graphql file in "/graphql" folder. Queries go to "/query", mutations go to "/mutations" etc.
+
+# Generating Types
+
+When you add a new GraphQL file, make sure to regenerate the types using the "generate" command from [package.json](mdc:package.json). It may take some time for the TS Server to detect the changes.