config(authentik): optimize DB connections and worker scaling

- Replace USE_PGBOUNCER with CONN_MAX_AGE=0 and CONN_HEALTH_CHECKS
- Reduce web workers to 1 with 2 threads (homelab scale)
- Update worker config: CONCURRENCY=1, THREADS=2
- Remove redundant Redis config from worker service

Reduces overall PostgreSQL connection count.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

stacks/authentik.yml

@@ -31,7 +31,12 @@ services:
       AUTHENTIK_POSTGRESQL__NAME: authentik
       AUTHENTIK_POSTGRESQL__USER: authentik_user
       AUTHENTIK_POSTGRESQL__PASSWORD: F//j0ktck7cX06Vfgh0YXceONOtlSsHvadqROICeDx8=
-      AUTHENTIK_POSTGRESQL__USE_PGBOUNCER: false
+      AUTHENTIK_POSTGRESQL__CONN_MAX_AGE: 0
+      AUTHENTIK_POSTGRESQL__CONN_HEALTH_CHECKS: true
+
+      # Worker scaling (reduced to limit DB connections)
+      AUTHENTIK_WEB__WORKERS: 1
+      AUTHENTIK_WEB__THREADS: 2
 
       # Secret key (generated: openssl rand -base64 32)
       AUTHENTIK_SECRET_KEY: TnFaTZ//RDcO2hxVR4QGOBORd5tfXe4Vok+lcAz/AdE=
@@ -90,18 +95,16 @@ services:
       AUTHENTIK_POSTGRESQL__NAME: authentik
       AUTHENTIK_POSTGRESQL__USER: authentik_user
       AUTHENTIK_POSTGRESQL__PASSWORD: F//j0ktck7cX06Vfgh0YXceONOtlSsHvadqROICeDx8=
-      AUTHENTIK_POSTGRESQL__USE_PGBOUNCER: false
-      AUTHENTIK_REDIS__HOST: redis-shared
-      AUTHENTIK_REDIS__PORT: 6379
-      AUTHENTIK_REDIS__DB: 0
+      AUTHENTIK_POSTGRESQL__CONN_MAX_AGE: 0
+      AUTHENTIK_POSTGRESQL__CONN_HEALTH_CHECKS: true
       AUTHENTIK_SECRET_KEY: TnFaTZ//RDcO2hxVR4QGOBORd5tfXe4Vok+lcAz/AdE=
       AUTHENTIK_LOG_LEVEL: warning
       AUTHENTIK_ERROR_REPORTING__ENABLED: false
       TZ: Europe/Amsterdam
 
       # Worker-specific configuration
-      AUTHENTIK_BOOTSTRAP_WORKERS: 1   # Single worker (homelab scale)
-      AUTHENTIK_WORKER__THREADS: 2  # 2 threads per worker
+      AUTHENTIK_WORKER__CONCURRENCY: 1
+      AUTHENTIK_WORKER__THREADS: 2
 
     volumes:
       - /home/jpmschweitzer/docker-data/authentik/media:/media