Add shared nginx-proxy role; deploy Hermes in Docker; rename Paperclip

nginx-proxy (new role):
- Shared nginx + certbot under /opt/nginx, replacing the copies that
  lived inside the Paperclip compose project
- Apps publish via tasks_from: add_vhost (cert marker -> issue cert ->
  write vhost -> nginx -t -> reload); a vhost that fails nginx -t is
  rolled back
- Certs issued one per domain via Cloudflare DNS challenge; domains
  registered as marker files in cert-domains/; optional LE staging
- Stock nginx.conf plus conf.d (directory mounts, not single-file
  mounts); catch-all server drops unknown Host/SNI
- Containers renamed to nginx and certbot

hermes_docker (new role):
- Official Hermes image, host networking, gateway and dashboard bound
  to loopback and published through nginx-proxy
- Dashboard login via basic-auth provider, secrets from the vault
- Main model set from hermes_model (fantasmic endpoint, key from vault);
  config.yaml overrides are merged from a 0600 staged file that is
  removed afterwards, so the key never appears in a command line
- Data dir owner-only (HERMES_HOME_MODE=0700)

paperclip-docker:
- Remove nginx, certbot and docker-compose download tasks; deploy with
  community.docker.docker_compose_v2 (idempotent, remove_orphans)
- Stop passing the Cloudflare token and certbot email to the Paperclip
  container via env_file
- Bind Postgres to 127.0.0.1 (host networking exposed it on all
  interfaces); stop chowning pgdata, which the postgres image owns
- Handler recreates the paperclip service so .env changes apply
- Domain m-v.wdw-labs.cloud -> cranium-command.wdw-labs.cloud

Playbooks:
- Add day1_deploy_nginx_proxy.yml and day1_deploy_hermes_docker.yml
- deploy_paperclip_stack.yml: run nginx-proxy before paperclip-docker,
  CLI-based container checks (no Docker SDK dependency)
- Remove deploy-hermes.yml

Host vars: add nginx_proxy_certbot_email and nginx_proxy_certbot_staging
(staging stays on until the switch to real certs).

ansible/roles/nginx-proxy/templates/00-global.conf.j2

@@ -0,0 +1,31 @@
+# Managed by Ansible (nginx-proxy role)
+# Included inside the stock nginx.conf http { } block, so these are http-level.
+server_tokens off;
+client_max_body_size {{ nginx_proxy_client_max_body_size }};
+
+ssl_protocols TLSv1.2 TLSv1.3;
+ssl_ciphers HIGH:!aNULL:!MD5;
+ssl_prefer_server_ciphers on;
+ssl_session_cache shared:SSL:10m;
+ssl_session_timeout 10m;
+
+# Catch-all: unknown Host headers get nothing, and unknown SNI is rejected
+# before any certificate is presented.
+server {
+    listen 80 default_server;
+    server_name _;
+    access_log off;
+
+    location = /nginx-health {
+        return 200 "ok\n";
+    }
+    location / {
+        return 444;
+    }
+}
+
+server {
+    listen 443 ssl default_server;
+    server_name _;
+    ssl_reject_handshake on;
+}