auth01: decommission host and remove authelia/lldap services

Remove auth01 host configuration and associated services in preparation
for new auth stack with different provisioning system.

Removed:
- hosts/auth01/ - host configuration
- services/authelia/ - authelia service module
- services/lldap/ - lldap service module
- secrets/auth01/ - sops secrets
- Reverse proxy entries for auth and lldap
- Monitoring alert rules for authelia and lldap
- SOPS configuration for auth01

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

services/monitoring/rules.yml

@@ -414,24 +414,6 @@ groups:
         annotations:
           summary: "PostgreSQL connection pool near exhaustion on {{ $labels.instance }}"
           description: "PostgreSQL is using over 80% of max_connections on {{ $labels.instance }}."
-  - name: auth_rules
-    rules:
-      - alert: authelia_down
-        expr: node_systemd_unit_state{instance="auth01.home.2rjus.net:9100", name="authelia-auth.service", state="active"} == 0
-        for: 5m
-        labels:
-          severity: critical
-        annotations:
-          summary: "Authelia not running on {{ $labels.instance }}"
-          description: "Authelia has been down on {{ $labels.instance }} more than 5 minutes."
-      - alert: lldap_down
-        expr: node_systemd_unit_state{instance="auth01.home.2rjus.net:9100", name="lldap.service", state="active"} == 0
-        for: 5m
-        labels:
-          severity: critical
-        annotations:
-          summary: "LLDAP not running on {{ $labels.instance }}"
-          description: "LLDAP has been down on {{ $labels.instance }} more than 5 minutes."
   - name: jellyfin_rules
     rules:
       - alert: jellyfin_down