Rebuild auth on Keycloak OIDC, fix rootless Ansible deploy

Replaces the single shared HTTP Basic service-account credential (which
caused a production outage from a username mismatch) with per-user login:
Keycloak (already running on this VM for gcnm, now also fronted on
auth.friessn.de with its own "homekeeper" realm) authenticates the user
once via the landing page, FastAPI verifies the OIDC id_token and mints
its own signed session JWT as a cookie, and both Shiny apps forward that
per-session token as a Bearer credential instead of a static shared one.
Authorization is a simple ALLOWED_USERS allowlist; the old auth.users
table and bcrypt seeding are gone entirely.

Also carries forward the in-progress rootless Podman/Quadlet migration
(gitea, homekeeper, podman roles) and fixes a pre-existing bug where
each role's handlers were malformed inside tasks/main.yml instead of
their own handlers/main.yml, which broke ansible-playbook entirely.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FbiCdckkTX2HyAkyi1R39d

infrastructure/roles/nginx/tasks/main.yml

@@ -14,37 +14,63 @@
     state: absent
   notify: Reload nginx
 
-- name: Deploy homekeeper nginx config
+# git.friessn.de already has its own site file (deployed manually before this
+# role existed, same one-file-per-domain convention as the other sites on this
+# box) — this role only manages home.friessn.de.
+- name: Deploy home.friessn.de nginx config
   template:
-    src: homekeeper.conf.j2
-    dest: /etc/nginx/sites-available/homekeeper.conf
+    src: home.friessn.de.conf.j2
+    dest: /etc/nginx/sites-available/home.friessn.de
     mode: "0644"
   notify: Reload nginx
 
-- name: Enable homekeeper nginx site
+- name: Enable home.friessn.de nginx site
   file:
-    src: /etc/nginx/sites-available/homekeeper.conf
-    dest: /etc/nginx/sites-enabled/homekeeper.conf
+    src: /etc/nginx/sites-available/home.friessn.de
+    dest: /etc/nginx/sites-enabled/home.friessn.de
     state: link
   notify: Reload nginx
 
-- name: Obtain Let's Encrypt certificates
+- name: Obtain Let's Encrypt certificate for {{ domain }}
   command: >
-    certbot --nginx -d {{ domain }} -d {{ gitea_domain }}
+    certbot --nginx -d {{ domain }}
     --non-interactive --agree-tos -m {{ gitea_admin_email }}
     --redirect
   args:
     creates: /etc/letsencrypt/live/{{ domain }}/fullchain.pem
   notify: Reload nginx
 
+# Keycloak itself runs as a plain Docker container for the unrelated gcnm
+# app (not managed by this role) — it's already published on
+# 127.0.0.1:8080, this just fronts it with TLS on its own subdomain so
+# Homekeeper (and anything else on the box) can treat it as a normal OIDC
+# provider. Requires a DNS record for {{ keycloak_domain }} pointing at this
+# VM before the certbot step below can succeed.
+- name: Deploy auth.friessn.de nginx config
+  template:
+    src: auth.friessn.de.conf.j2
+    dest: /etc/nginx/sites-available/{{ keycloak_domain }}
+    mode: "0644"
+  notify: Reload nginx
+
+- name: Enable auth.friessn.de nginx site
+  file:
+    src: /etc/nginx/sites-available/{{ keycloak_domain }}
+    dest: /etc/nginx/sites-enabled/{{ keycloak_domain }}
+    state: link
+  notify: Reload nginx
+
+- name: Obtain Let's Encrypt certificate for {{ keycloak_domain }}
+  command: >
+    certbot --nginx -d {{ keycloak_domain }}
+    --non-interactive --agree-tos -m {{ gitea_admin_email }}
+    --redirect
+  args:
+    creates: /etc/letsencrypt/live/{{ keycloak_domain }}/fullchain.pem
+  notify: Reload nginx
+
 - name: Enable nginx
   service:
     name: nginx
     enabled: true
     state: started
-
-handlers:
-  - name: Reload nginx
-    service:
-      name: nginx
-      state: reloaded