Implement Platform Superuser UI and Fix API Role Casing

- Update API to return lowercase roles for frontend compatibility
- Fix Tenant owner lookup in platform admin serializer
- Update frontend App.tsx to match tarball implementation
- Prioritize vite.config.js for HMR support
- Include pending CSP and CORS configuration updates

frontend/vite.config.ts.disabled

@@ -0,0 +1,17 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+// https://vitejs.dev/config/
+export default defineConfig({
+    plugins: [react()],
+    server: {
+        host: true,
+        port: 5173,
+        strictPort: false,
+        allowedHosts: [
+            'localhost',
+            '.lvh.me',
+            'lvh.me'
+        ],
+    }
+})