chore: update VPN routing configuration and add Grafana VPN documentation

deployment/ansible/playbooks/check-grafana-after-test.yml

@@ -0,0 +1,68 @@
+---
+- name: Check Grafana Logs After Test
+  hosts: production
+  gather_facts: no
+  become: no
+
+  tasks:
+    - name: Check last 20 Grafana access attempts
+      shell: |
+        cd ~/deployment/stacks/traefik
+        tail -200 logs/access.log | grep -i grafana | tail -20
+      args:
+        executable: /bin/bash
+      register: latest_logs
+      ignore_errors: yes
+      failed_when: false
+
+    - name: Extract client IPs with timestamps
+      shell: |
+        cd ~/deployment/stacks/traefik
+        tail -100 logs/access.log | grep -i grafana | tail -10 | while IFS= read -r line; do
+          time=$(echo "$line" | grep -oP '"time":"[^"]*"' | sed 's/"time":"//;s/"//' | cut -d'T' -f2 | cut -d'+' -f1)
+          client=$(echo "$line" | grep -oP '"ClientHost":"[^"]*"' | sed 's/"ClientHost":"//;s/"//')
+          status=$(echo "$line" | grep -oP '"DownstreamStatus":[0-9]+' | sed 's/"DownstreamStatus"://')
+          if [[ "$client" =~ ^10\.8\.0\.[0-9]+$ ]]; then
+            echo "$time | ClientHost: $client | Status: $status ? VPN-IP (Traffic kommt ?ber VPN!)"
+          elif [[ "$client" == "89.246.96.244" ]]; then
+            echo "$time | ClientHost: $client | Status: $status ? ?ffentliche IP (Traffic kommt NICHT ?ber VPN)"
+          else
+            echo "$time | ClientHost: $client | Status: $status ? Unbekannt"
+          fi
+        done
+      args:
+        executable: /bin/bash
+      register: analysis
+      ignore_errors: yes
+      failed_when: false
+
+    - name: Display analysis
+      debug:
+        msg: "{{ analysis.stdout_lines }}"
+
+    - name: Get unique client IPs
+      shell: |
+        cd ~/deployment/stacks/traefik
+        tail -100 logs/access.log | grep -i grafana | tail -10 | grep -oP '"ClientHost":"[^"]*"' | sed 's/"ClientHost":"//;s/"//' | sort -u
+      args:
+        executable: /bin/bash
+      register: unique_ips
+      ignore_errors: yes
+      failed_when: false
+
+    - name: Display unique IPs
+      debug:
+        msg: "{{ unique_ips.stdout_lines }}"
+
+    - name: Final result
+      debug:
+        msg:
+          - ""
+          - "=== ERGEBNIS ==="
+          - "Pr?fe die obigen Zeilen:"
+          - ""
+          - "? Wenn ClientHost: 10.8.0.7 ? Traffic kommt ?ber VPN!"
+          - "   ? Dann k?nnen wir die tempor?re IP-Erlaubnis entfernen!"
+          - ""
+          - "? Wenn ClientHost: 89.246.96.244 ? Traffic kommt NICHT ?ber VPN"
+          - "   ? Dann m?ssen wir weiter debuggen"