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>

.sops.yaml

@@ -10,7 +10,6 @@ keys:
   - &server_nix-cache01 age1w029fksjv0edrff9p7s03tgk3axecdkppqymfpwfn2nu2gsqqefqc37sxq
   - &server_pgdb1 age1ha34qeksr4jeaecevqvv2afqem67eja2mvawlmrqsudch0e7fe7qtpsekv
   - &server_nats1 age1cxt8kwqzx35yuldazcc49q88qvgy9ajkz30xu0h37uw3ts97jagqgmn2ga
-  - &server_auth01 age16prza00sqzuhwwcyakj6z4hvwkruwkqpmmrsn94a5ucgpkelncdq2ldctk
 creation_rules:
   - path_regex: secrets/[^/]+\.(yaml|json|env|ini)
     key_groups:
@@ -26,7 +25,6 @@ creation_rules:
         - *server_nix-cache01
         - *server_pgdb1
         - *server_nats1
-        - *server_auth01
   - path_regex: secrets/ca/[^/]+\.(yaml|json|env|ini|)
     key_groups:
       - age:
@@ -52,8 +50,3 @@ creation_rules:
       - age:
         - *admin_torjus
         - *server_http-proxy
-  - path_regex: secrets/auth01/[^/]+\.(yaml|json|env|ini|)
-    key_groups:
-      - age:
-        - *admin_torjus
-        - *server_auth01