feat: Passwordless cross-device authentication

- Arkitektur: docs/auth/passwordless-architecture.md
- Backend: iom/quixzoom-auth-service/ (FastAPI + Redis)
- Webb: quixzoom-market-pages/se/login/ (QR-kod + polling)
- App: iom/quixzoom-app/src/features/auth/ (push + deep links)

Flöde: QR-kod → app-godkännande → webb-inloggad

landvex/node_modules/highlight.js/lib/languages/leaf.js

@@ -0,0 +1,49 @@
+/*
+Language: Leaf
+Author: Hale Chan <halechan@qq.com>
+Description: Based on the Leaf reference from https://vapor.github.io/documentation/guide/leaf.html.
+*/
+
+function leaf(hljs) {
+  return {
+    name: 'Leaf',
+    contains: [
+      {
+        className: 'function',
+        begin: '#+' + '[A-Za-z_0-9]*' + '\\(',
+        end: / \{/,
+        returnBegin: true,
+        excludeEnd: true,
+        contains: [
+          {
+            className: 'keyword',
+            begin: '#+'
+          },
+          {
+            className: 'title',
+            begin: '[A-Za-z_][A-Za-z_0-9]*'
+          },
+          {
+            className: 'params',
+            begin: '\\(',
+            end: '\\)',
+            endsParent: true,
+            contains: [
+              {
+                className: 'string',
+                begin: '"',
+                end: '"'
+              },
+              {
+                className: 'variable',
+                begin: '[A-Za-z_][A-Za-z_0-9]*'
+              }
+            ]
+          }
+        ]
+      }
+    ]
+  };
+}
+
+module.exports = leaf;