fix: configure gitea webhook auto-deploy, fix NVS CRC, and improve flash UI

- Add deploy-host.sh for webhook-triggered docker redeploy
- Update docker-compose.yml and nginx.conf for auto-pull setup
- Fix vite.config.js and admin router for deployment environment
- Fix NVS CRC seed to use 0xFFFFFFFF to match esp_rom_crc32_le
- Add dual-panel flash UI: esptool log + live 115200 serial monitor
- Auto-reset device via RTS after flash (no manual power cycle needed)
- Clean up Header.jsx debug title text

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/vite.config.js

@@ -7,6 +7,7 @@ export default defineConfig({
   server: {
     host: '0.0.0.0',
     port: 5173,
+    allowedHosts: ['console.bellsystems.net'],
     hmr: {
       clientPort: 80,
     },