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/templates/home.friessn.de.conf.j2

@@ -0,0 +1,59 @@
+map $http_upgrade $connection_upgrade {
+    default upgrade;
+    ''      close;
+}
+
+# ── Main app: {{ domain }} ───────────────────────────────────────────────────
+server {
+    listen 80;
+    server_name {{ domain }};
+    # certbot --nginx adds SSL redirect + listen 443 block here
+
+    root /var/www/html;
+    index index.html;
+
+    location = / {
+        try_files /index.html =404;
+    }
+
+    location = /api { return 301 /api/; }
+    location /api/ {
+        rewrite ^/api/(.*) /$1 break;
+        proxy_pass         http://127.0.0.1:8000;
+        proxy_http_version 1.1;
+        proxy_set_header   Host              $host;
+        proxy_set_header   X-Real-IP         $remote_addr;
+        proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
+        proxy_set_header   X-Forwarded-Proto $scheme;
+    }
+
+    location = /beekeeper { return 301 /beekeeper/; }
+    location /beekeeper/ {
+        rewrite ^/beekeeper/(.*) /$1 break;
+        proxy_pass         http://127.0.0.1:3838;
+        proxy_http_version 1.1;
+        proxy_set_header   Upgrade           $http_upgrade;
+        proxy_set_header   Connection        $connection_upgrade;
+        proxy_set_header   Host              $host;
+        proxy_set_header   X-Real-IP         $remote_addr;
+        proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
+        proxy_set_header   X-Forwarded-Proto $scheme;
+        proxy_read_timeout 86400s;
+        proxy_send_timeout 86400s;
+    }
+
+    location = /listkeeper { return 301 /listkeeper/; }
+    location /listkeeper/ {
+        rewrite ^/listkeeper/(.*) /$1 break;
+        proxy_pass         http://127.0.0.1:3839;
+        proxy_http_version 1.1;
+        proxy_set_header   Upgrade           $http_upgrade;
+        proxy_set_header   Connection        $connection_upgrade;
+        proxy_set_header   Host              $host;
+        proxy_set_header   X-Real-IP         $remote_addr;
+        proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;
+        proxy_set_header   X-Forwarded-Proto $scheme;
+        proxy_read_timeout 86400s;
+        proxy_send_timeout 86400s;
+    }
+}