Add healthchecks and resource constraints to all services

Added healthchecks:
- adminer: PHP file_get_contents check
- authentik_server: ak healthcheck command
- authentik_redis: redis-cli ping
- paperless_redis: redis-cli ping
- paperless_webserver: curl localhost:8000
- n8n: wget healthz endpoint
- traefik: wget ping endpoint (with --ping enabled)
- tracker-nginx: curl localhost:80

Added resource limits:
- adminer: 512M limit, 128M reservation
- authentik_server: 1G/1 CPU limit, 512M reservation
- authentik_worker: 1G/1 CPU limit, 512M reservation
- authentik_redis: 512M limit, 128M reservation
- paperless_redis: 512M limit, 128M reservation
- paperless_webserver: 2G/2 CPU limit, 1G reservation
- traefik: 512M/0.5 CPU limit, 256M reservation
- tracker-nginx: 256M limit, 64M reservation

All services now have proper health monitoring and resource constraints
to prevent resource exhaustion and improve reliability.

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

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

stacks/apps/adminer/stack.yml

@@ -8,8 +8,19 @@ services:
     environment:
     - ADMINER_DEFAULT_SERVER=10.0.4.10
     - ADMINER_DESIGN=nette
+    healthcheck:
+      test: ["CMD", "php", "-r", "if (file_get_contents('http://localhost:8080')) exit(0); exit(1);"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 20s
     deploy:
       replicas: 1
+      resources:
+        limits:
+          memory: 512M
+        reservations:
+          memory: 128M
 networks:
   homelab:
     external: true