Update SSL certificate, NGINX configuration, and pgAdmin setup

- Updated the SSL certificate for yuri.phx-erp.de with a new signed certificate.
- Added a new NGINX configuration file for pgAdmin reverse proxy under the subpath /pgadmin4.
- Enhanced the main NGINX configuration with improved logging, security headers, and real IP handling.
- Implemented health check endpoints for both system and worker services with IP whitelisting.
- Created a new entrypoint script for pgAdmin to manage .pgpass and servers.json configuration.
- Removed the redis.conf file and commented out Redis session caching in the configuration.

https_portal/data/yuri.phx-erp.de/production/signed.crt

@@ -1,31 +1,31 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
 
 -----BEGIN CERTIFICATE-----