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/loose-envify/cli.js

@@ -0,0 +1,16 @@
+#!/usr/bin/env node
+'use strict';
+
+var looseEnvify = require('./');
+var fs = require('fs');
+
+if (process.argv[2]) {
+  fs.createReadStream(process.argv[2], {encoding: 'utf8'})
+    .pipe(looseEnvify(process.argv[2]))
+    .pipe(process.stdout);
+} else {
+  process.stdin.resume()
+  process.stdin
+    .pipe(looseEnvify(__filename))
+    .pipe(process.stdout);
+}