Add embedded Swagger UI page with auto-injected JWT auth

- New /swagger route with lazy-loaded SwaggerPage that initializes
  swagger-ui-dist and injects the session JWT via requestInterceptor
- Move API link from primary nav to navRight utility area (pill style)
- Code-split swagger chunk (~1.4 MB) so main bundle stays lean

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/package.json

@@ -18,6 +18,7 @@
     "react": "^19.2.4",
     "react-dom": "^19.2.4",
     "react-router": "^7.13.1",
+    "swagger-ui-dist": "^5.32.0",
     "uplot": "^1.6.32",
     "zustand": "^5.0.11"
   },