feat: production-ready dashboard with proper auth persistence

- Add dashboard UI showing connection status, webhooks, and email config
- Fix FileAPL to use fileName param for persistent /data volume storage
- Configure production domains and webhooks
- Add dev tunnel script for local testing
- Update Dockerfile and build config for K3s deployment

The app is now successfully installed and running at:
https://core-extensions.manoonoils.com

CONFIG_CHECKLIST.md

@@ -0,0 +1,18 @@
+# Configuration Checklist
+
+## Environment Variables (Required)
+- [x] APP_API_BASE_URL = https://core-extensions.manoonoils.com
+- [x] APP_IFRAME_BASE_URL = https://core-extensions.manoonoils.com
+- [x] AUTH_DATA_FILE_PATH = /data/.auth-data.json
+- [x] SETTINGS_FILE_PATH = /data/.app-settings.json
+- [x] SALEOR_API_URL = http://saleor-api.saleor:8000/graphql/
+
+## File System
+- [x] /data is a persistent volume (PVC mounted)
+- [x] nextjs user (uid 1001) has write access to /data
+- [x] FileAPL configured to use AUTH_DATA_FILE_PATH
+
+## Networking
+- [x] Ingress: core-extensions.manoonoils.com
+- [x] Service exposes port 3000
+- [x] Container runs as nextjs user (not root)