fix: Gitea Traefik routing and connection pool optimization

- Remove middleware reference from Gitea Traefik labels (caused routing issues)
- Optimize Gitea connection pool settings (MAX_IDLE_CONNS=30, authentication_timeout=180s)
- Add explicit service reference in Traefik labels
- Fix intermittent 504 timeouts by improving PostgreSQL connection handling

Fixes Gitea unreachability via git.michaelschiemer.de

deployment/ansible/playbooks/restart-gitea-with-cache.yml

@@ -0,0 +1,57 @@
+---
+# Ansible Playbook: Restart Gitea with Redis Cache Enabled
+# Purpose: Restart Gitea container to apply new cache configuration from docker-compose.yml
+# Usage:
+#   ansible-playbook -i inventory/production.yml playbooks/restart-gitea-with-cache.yml
+
+- name: Restart Gitea with Redis Cache Enabled
+  hosts: production
+  vars:
+    gitea_stack_path: "{{ stacks_base_path }}/gitea"
+    gitea_url: "https://{{ gitea_domain }}"
+
+  tasks:
+    - name: Verify Gitea container exists
+      shell: |
+        docker compose -f {{ gitea_stack_path }}/docker-compose.yml ps gitea | grep -q "gitea"
+      register: gitea_exists
+      changed_when: false
+      failed_when: false
+
+    - name: Fail if Gitea container does not exist
+      fail:
+        msg: "Gitea container does not exist. Please deploy Gitea stack first."
+      when: gitea_exists.rc != 0
+
+    - name: Recreate Gitea container with new cache configuration
+      shell: |
+        cd {{ gitea_stack_path }} && \
+        docker compose up -d --force-recreate gitea
+      register: gitea_recreated
+
+    - name: Wait for Gitea to be ready after restart
+      uri:
+        url: "{{ gitea_url }}/api/healthz"
+        method: GET
+        status_code: [200]
+        validate_certs: false
+        timeout: 10
+      register: gitea_health_after_restart
+      until: gitea_health_after_restart.status == 200
+      retries: 30
+      delay: 5
+      changed_when: false
+
+    - name: Display success message
+      debug:
+        msg: |
+          Gitea has been restarted successfully with Redis cache enabled!
+          
+          Cache configuration:
+          - ENABLED: true
+          - ADAPTER: redis
+          - HOST: redis:6379
+          - DB: 0
+          
+          Gitea should now use Redis for caching, improving performance.
+