feat: Add Proxmox LXC auto-enrollment integration

- Add auto_enrollment_tokens table with rate limiting and IP whitelisting
- Create backend API routes for token management and enrollment
- Build frontend UI for token creation and management
- Add one-liner curl command for easy Proxmox deployment
- Include Proxmox LXC discovery and enrollment script
- Support future integrations with /proxmox-lxc endpoint pattern
- Add comprehensive documentation

Security features:
- Hashed token secrets
- Per-day rate limits
- IP whitelist support
- Token expiration
- Separate enrollment vs host API credentials

backend/src/server.js

@@ -25,6 +25,7 @@ const repositoryRoutes = require("./routes/repositoryRoutes");
 const versionRoutes = require("./routes/versionRoutes");
 const tfaRoutes = require("./routes/tfaRoutes");
 const searchRoutes = require("./routes/searchRoutes");
+const autoEnrollmentRoutes = require("./routes/autoEnrollmentRoutes");
 const updateScheduler = require("./services/updateScheduler");
 const { initSettings } = require("./services/settingsService");
 const { cleanup_expired_sessions } = require("./utils/session_manager");
@@ -380,6 +381,11 @@ app.use(`/api/${apiVersion}/repositories`, repositoryRoutes);
 app.use(`/api/${apiVersion}/version`, versionRoutes);
 app.use(`/api/${apiVersion}/tfa`, tfaRoutes);
 app.use(`/api/${apiVersion}/search`, searchRoutes);
+app.use(
+	`/api/${apiVersion}/auto-enrollment`,
+	authLimiter,
+	autoEnrollmentRoutes,
+);
 
 // Error handling middleware
 app.use((err, _req, res, _next) => {