monitoring02: enable alerting and migrate CNAMEs from http-proxy

- Switch vmalert from blackhole mode to sending alerts to local
  Alertmanager
- Import alerttonotify service so alerts route to NATS notifications
- Move alertmanager and grafana CNAMEs from http-proxy to monitoring02
- Add monitoring CNAME to monitoring02
- Add Caddy reverse proxy entries for alertmanager and grafana
- Remove prometheus, alertmanager, and grafana Caddy entries from
  http-proxy (now served directly by monitoring02)
- Move monitoring02 Vault AppRole to hosts-generated.tf with
  extra_policies support and prometheus-metrics policy
- Update Promtail to use authenticated loki.home.2rjus.net endpoint
  only (remove unauthenticated monitoring01 client)
- Update pipe-to-loki and bootstrap to use loki.home.2rjus.net with
  basic auth from Vault secret
- Move migration plan to completed

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

hosts/http-proxy/configuration.nix

@@ -18,9 +18,6 @@
     "sonarr"
     "ha"
     "z2m"
-    "grafana"
-    "prometheus"
-    "alertmanager"
     "jelly"
     "pyroscope"
     "pushgw"

hosts/monitoring02/configuration.nix

@@ -18,7 +18,7 @@
     role = "monitoring";
   };
 
-  homelab.dns.cnames = [ "grafana-test" "metrics" "vmalert" "loki" ];
+  homelab.dns.cnames = [ "monitoring" "alertmanager" "grafana" "grafana-test" "metrics" "vmalert" "loki" ];
 
   # Enable Vault integration
   vault.enable = true;

hosts/monitoring02/default.nix

@@ -4,5 +4,6 @@
     ../../services/grafana
     ../../services/victoriametrics
     ../../services/loki
+    ../../services/monitoring/alerttonotify.nix
   ];
 }

hosts/template2/bootstrap.nix

@@ -6,7 +6,8 @@ let
     text = ''
       set -euo pipefail
 
-      LOKI_URL="http://monitoring01.home.2rjus.net:3100/loki/api/v1/push"
+      LOKI_URL="https://loki.home.2rjus.net/loki/api/v1/push"
+      LOKI_AUTH_FILE="/run/secrets/promtail-loki-auth"
 
       # Send a log entry to Loki with bootstrap status
       # Usage: log_to_loki <stage> <message>
@@ -36,8 +37,14 @@ let
             }]
           }')
 
+        local auth_args=()
+        if [[ -f "$LOKI_AUTH_FILE" ]]; then
+          auth_args=(-u "promtail:$(cat "$LOKI_AUTH_FILE")")
+        fi
+
         curl -s --connect-timeout 2 --max-time 5 \
           -X POST \
+          "''${auth_args[@]}" \
           -H "Content-Type: application/json" \
           -d "$payload" \
           "$LOKI_URL" >/dev/null 2>&1 || true