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/test-gitea-after-fix.yml

@@ -0,0 +1,73 @@
+---
+# Test Gitea After Connection Pool Fix
+- name: Test Gitea After Connection Pool Fix
+  hosts: production
+  gather_facts: no
+  become: no
+  vars:
+    gitea_stack_path: "{{ stacks_base_path }}/gitea"
+    gitea_url: "https://{{ gitea_domain }}"
+
+  tasks:
+    - name: Test Gitea health endpoint
+      ansible.builtin.uri:
+        url: "{{ gitea_url }}/api/healthz"
+        method: GET
+        validate_certs: false
+        timeout: 35
+      register: gitea_test
+      changed_when: false
+
+    - name: Check Gitea logs for connection pool messages
+      ansible.builtin.shell: |
+        cd {{ gitea_stack_path }}
+        docker compose logs gitea --tail 100 | grep -iE "timeout.*authentication|connection.*pool|MAX_OPEN_CONNS|database.*pool" | tail -20 || echo "No connection pool messages found"
+      register: gitea_logs_check
+      changed_when: false
+      failed_when: false
+
+    - name: Check Postgres logs for authentication timeouts
+      ansible.builtin.shell: |
+        cd {{ gitea_stack_path }}
+        docker compose logs postgres --tail 50 | grep -iE "timeout.*authentication|authentication.*timeout" | tail -10 || echo "No authentication timeout messages found"
+      register: postgres_logs_check
+      changed_when: false
+      failed_when: false
+
+    - name: Display test results
+      ansible.builtin.debug:
+        msg: |
+          ================================================================================
+          GITEA CONNECTION POOL FIX - TEST RESULTS
+          ================================================================================
+          
+          Health Check Result:
+          - Status: {{ gitea_test.status | default('TIMEOUT') }}
+          - Response Time: {{ gitea_test.elapsed | default('N/A') }}s
+          {% if gitea_test.status | default(0) == 200 %}
+          ✅ Gitea is reachable
+          {% else %}
+          ❌ Gitea returned status {{ gitea_test.status | default('TIMEOUT') }}
+          {% endif %}
+          
+          Gitea Logs (Connection Pool):
+          {{ gitea_logs_check.stdout }}
+          
+          Postgres Logs (Authentication Timeouts):
+          {{ postgres_logs_check.stdout }}
+          
+          ================================================================================
+          INTERPRETATION:
+          ================================================================================
+          
+          {% if 'timeout.*authentication' in gitea_logs_check.stdout | lower or 'timeout.*authentication' in postgres_logs_check.stdout | lower %}
+          ⚠️  Authentication timeout messages still present
+          → Connection pool settings may need further tuning
+          → Consider increasing MAX_OPEN_CONNS or authentication_timeout
+          {% else %}
+          ✅ No authentication timeout messages found
+          → Connection pool fix appears to be working
+          {% endif %}
+          
+          ================================================================================
+