feat(qr-server): use Python SDK meta parameter for resource CSP metadata (#303)

* update qr-server w/ python sdk fix

* feat(qr-server): use Python SDK meta parameter for resource CSP metadata

- Update qr-server to use the new meta parameter on @mcp.resource decorator
  instead of manually overriding the read_resource handler
- Add ui.resourceUri to tool meta alongside legacy ui/resourceUri for forward compatibility
- Simplify server.py by removing the custom _read_resource_with_meta handler
- Add qr-server to grid screenshot generation tests
- Update grid-cell.png screenshot

This leverages the Python SDK's native support for resource metadata,
eliminating the need for low-level handler manipulation.

Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: Claude <noreply@anthropic.com>

tests/e2e/generate-grid-screenshots.spec.ts

@@ -54,6 +54,8 @@ const SERVERS = [
   },
   { key: "map-server", name: "Map Server", dir: "map-server" },
   { key: "pdf-server", name: "PDF Server", dir: "pdf-server" },
+  { key: "qr-server", name: "QR Code Server", dir: "qr-server" },
+  { key: "say-server", name: "Say Demo", dir: "say-server" },
   {
     key: "scenario-modeler",
     name: "SaaS Scenario Modeler",