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/podman/tasks/main.yml

@@ -4,18 +4,14 @@
     name:
       - podman
       - podman-compose   # for ad-hoc use; production uses quadlets
+      - slirp4netns      # rootless networking / port publishing
+      - uidmap           # rootless subuid/subgid mapping
     state: present
     update_cache: true
 
-- name: Create homekeeper data directories
-  file:
-    path: "{{ item }}"
-    state: directory
-    mode: "0750"
-  loop:
-    - "{{ homekeeper_data_dir }}"
-    - "{{ homekeeper_data_dir }}/pg_data"
-    - "{{ gitea_data_dir }}"
+# All app data lives in named Podman volumes (created implicitly on first
+# `podman run`/Quadlet start), not host bind mounts — avoids rootless UID
+# mapping headaches. Nothing to pre-create here.
 
 - name: Configure Gitea as additional registry
   template:
@@ -25,35 +21,46 @@
   notify: Restart podman services
 
 - name: Login to Gitea container registry
+  become_user: "{{ deploy_user }}"
+  environment:
+    XDG_RUNTIME_DIR: "/run/user/{{ deploy_uid }}"
   command: >
-    podman login {{ registry_host }}:{{ registry_port }}
+    podman login {{ registry_host }}
     -u {{ registry_user }} -p {{ registry_token }}
   register: login_result
   changed_when: "'Login Succeeded' in login_result.stdout"
   # Run this after Gitea is up and registry_token is set
 
-- name: Enable podman-auto-update timer
+- name: Enable linger for {{ deploy_user }} (user services survive logout/reboot)
+  command: "loginctl enable-linger {{ deploy_user }}"
+  changed_when: false
+
+- name: Enable podman-auto-update timer (user scope)
+  become_user: "{{ deploy_user }}"
+  environment:
+    XDG_RUNTIME_DIR: "/run/user/{{ deploy_uid }}"
   systemd:
     name: podman-auto-update.timer
     enabled: true
     state: started
+    scope: user
     daemon_reload: true
 
-- name: Override auto-update timer schedule
+- name: Override auto-update timer schedule (user scope)
+  become_user: "{{ deploy_user }}"
+  file:
+    path: "/home/{{ deploy_user }}/.config/systemd/user/podman-auto-update.timer.d"
+    state: directory
+    mode: "0755"
+
+- name: Deploy auto-update timer schedule override
+  become_user: "{{ deploy_user }}"
   copy:
-    dest: /etc/systemd/system/podman-auto-update.timer.d/override.conf
+    dest: "/home/{{ deploy_user }}/.config/systemd/user/podman-auto-update.timer.d/override.conf"
     content: |
       [Timer]
       OnCalendar=
       OnCalendar={{ autoupdate_schedule }}
       AccuracySec=1s
     mode: "0644"
-  notify: Reload systemd
-
-handlers:
-  - name: Reload systemd
-    systemd:
-      daemon_reload: true
-
-  - name: Restart podman services
-    command: systemctl daemon-reload
+  notify: Reload user systemd