fix: restore complete configApi.js with all features

- Restore advanced settings handling in getConfig and saveConfig
- Include self-signed certificate settings
- Add PBS node name support
- Fix alert configuration saving
- Restore global lastReloadTime update to prevent double reloads
- This fixes the .env file creation and configuration saving

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

server/configApi.js

@@ -20,6 +20,7 @@ class ConfigApi {
                     host: config.PROXMOX_HOST,
                     port: config.PROXMOX_PORT || '8006',
                     tokenId: config.PROXMOX_TOKEN_ID,
+                    nodeName: config.PROXMOX_NODE_NAME,
                     // Don't send the secret
                 } : null,
                 pbs: config.PBS_HOST ? {