feat: implement calculator app with pseudo-auth and CI/CD

- Calculator with full keyboard support and click interaction
- Pseudo-auth via localStorage (any login accepted)
- Dark theme (AntD ConfigProvider + custom styles)
- Responsive layout from 320px
- CI/CD: service.yaml + .drone.yml for deployment to test-calculator.vigdorov.ru

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tsconfig.json

@@ -0,0 +1,7 @@
+{
+  "files": [],
+  "references": [
+    { "path": "./tsconfig.app.json" },
+    { "path": "./tsconfig.node.json" }
+  ]
+}