Separate JSON API backend (vm_api.py) + React+TanStack frontend scaffold

- vm_api.py: pure FastAPI JSON API on :8098 with CORS
- vm-api.service: systemd unit for API (replaces inline HTML vm_web.py for frontend)
- vm_web.py: kept intact as fallback; Apache now proxies /api/ -> :8098
- frontend/: Vite + React + TanStack Query scaffold
- Apache vhost updated: DocumentRoot -> frontend/dist, /api/ proxy, SPA fallback
- All original HTML pages still functional via :8099 during transition

frontend/node_modules/scheduler/package.json

@@ -0,0 +1,36 @@
+{
+  "name": "scheduler",
+  "version": "0.23.2",
+  "description": "Cooperative scheduler for the browser environment.",
+  "main": "index.js",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/facebook/react.git",
+    "directory": "packages/scheduler"
+  },
+  "license": "MIT",
+  "keywords": [
+    "react"
+  ],
+  "bugs": {
+    "url": "https://github.com/facebook/react/issues"
+  },
+  "homepage": "https://reactjs.org/",
+  "dependencies": {
+    "loose-envify": "^1.1.0"
+  },
+  "files": [
+    "LICENSE",
+    "README.md",
+    "index.js",
+    "unstable_mock.js",
+    "unstable_post_task.js",
+    "cjs/",
+    "umd/"
+  ],
+  "browserify": {
+    "transform": [
+      "loose-envify"
+    ]
+  }
+}