Add resource limits to all Docker containers

- fail2ban: 0.5 CPU / 128M memory limit, 0.1 CPU / 64M reserved
- backend: 2.0 CPU / 512M memory limit, 1.0 CPU / 256M reserved
- frontend: 0.5 CPU / 128M memory limit, 0.25 CPU / 64M reserved

Prevents 'noisy neighbor' scenarios where one container exhausts
host resources (CPU, memory, disk). Limits are hard caps; reservations
guarantee minimum allocation to prevent OOM kills and ensure
responsive service even under load.

Fixes resource contention issue in production and staging environments.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Docker/docker-compose.yml

@@ -26,6 +26,13 @@ services:
       #- /path/to/unificontroller/log:/remotelogs/unificontroller:ro #optional
       #- /path/to/vaultwarden/log:/remotelogs/vaultwarden:ro #optional
     restart: unless-stopped
+    deploy:
+      limits:
+        cpus: '0.5'
+        memory: 128M
+      reservations:
+        cpus: '0.1'
+        memory: 64M
 
   backend:
       image: git.lpl-mind.de/lukas.pupkalipinski/bangui/backend:latest
@@ -53,6 +60,13 @@ services:
         - "8000"
       networks:
         - bangui-net
+      deploy:
+        limits:
+          cpus: '2'
+          memory: 512M
+        reservations:
+          cpus: '1'
+          memory: 256M
   
     # ── Frontend (nginx serving built SPA + API proxy) ──────────
   frontend:
@@ -69,6 +83,13 @@ services:
         condition: service_started
     networks:
       - bangui-net
+    deploy:
+      limits:
+        cpus: '0.5'
+        memory: 128M
+      reservations:
+        cpus: '0.25'
+        memory: 64M
   
 networks:
   bangui-net: