chore: initial project setup with backend, frontend, Android app, and CI/CD

Add complete NexaMFA push MFA system with:
- FastAPI backend with PostgreSQL, Redis, OIDC provider, and Prometheus metrics
- React TypeScript admin console
- Android Kotlin/Jetpack Compose app with biometric authentication
- Docker Compose deployment configuration
- Gitea CI workflow for backend, frontend, and Android builds
- Environment configuration template with security settings
- Documentation for security model, deployment

frontend/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "nexamfa-admin",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite --host 0.0.0.0",
+    "build": "tsc && vite build",
+    "preview": "vite preview --host 0.0.0.0"
+  },
+  "dependencies": {
+    "@vitejs/plugin-react": "latest",
+    "lucide-react": "latest",
+    "vite": "latest",
+    "react": "latest",
+    "react-dom": "latest"
+  },
+  "devDependencies": {
+    "typescript": "latest",
+    "@types/react": "latest",
+    "@types/react-dom": "latest"
+  }
+}