Improve logging and infrastructure variable consistency

Changes:
- Migrate Authentik to journald logging (remove file-based logs)
- Update Gitea to use infrastructure variables for PostgreSQL access
- Add comprehensive logging documentation to deployment guide
- Add infrastructure variable pattern guide to integration docs

Authentik Logging:
- Remove LogDriver=k8s-file from server and worker containers
- Remove logs directory creation from user setup tasks
- Update deployment guide with journald examples and JSON log patterns

Gitea Infrastructure Variables:
- Add infrastructure dependencies section to role defaults
- Replace hardcoded paths with postgresql_unix_socket_directories variable
- Replace hardcoded 'postgres' group with postgresql_client_group variable
- Add infrastructure variable validation in tasks
- Remove manual socket permission override (handled by infrastructure)

Documentation:
- Add journald logging best practices to service integration guide
- Add infrastructure variable pattern documentation with Gitea example
- Update Authentik deployment guide with journald commands and JSON filtering
- Document benefits: centralized logging, single source of truth, maintainability

Validated on arch-vps:
- Authentik logs accessible via journalctl and podman logs (identical output)
- Gitea user added to postgres-clients group (GID 962)
- No PostgreSQL socket permission errors after service restart

roles/authentik/templates/authentik-server.container

@@ -11,11 +11,6 @@ EnvironmentFile={{ authentik_home }}/.env
 User={{ authentik_uid }}:{{ authentik_gid }}
 PodmanArgs=--group-add {{ postgresql_client_group_gid }} --group-add {{ valkey_client_group_gid }}
 
-# Logging configuration
-LogDriver=k8s-file
-LogOpt=path={{ authentik_home }}/logs/server.log
-Volume={{ authentik_home }}/logs:{{ authentik_home }}/logs
-
 # Volume mounts for data and sockets
 Volume={{ authentik_media_dir }}:/media
 Volume={{ authentik_data_dir }}:/data

roles/authentik/templates/authentik-worker.container

@@ -11,11 +11,6 @@ EnvironmentFile={{ authentik_home }}/.env
 User={{ authentik_uid }}:{{ authentik_gid }}
 PodmanArgs=--group-add {{ postgresql_client_group_gid }} --group-add {{ valkey_client_group_gid }}
 
-# Logging configuration
-LogDriver=k8s-file
-LogOpt=path={{ authentik_home }}/logs/worker.log
-Volume={{ authentik_home }}/logs:{{ authentik_home }}/logs
-
 # Volume mounts for data and sockets
 Volume={{ authentik_media_dir }}:/media
 Volume={{ authentik_data_dir }}:/data