chore: update VPN routing configuration and add Grafana VPN documentation

deployment/ansible/playbooks/check-vpn-routing-status.yml

@@ -0,0 +1,63 @@
+---
+- name: Check VPN Routing Status - Client-Side Diagnostics
+  hosts: production
+  gather_facts: no
+  become: no
+
+  tasks:
+    - name: Instructions for client-side DNS check
+      debug:
+        msg:
+          - "=== CLIENT-SIDE DNS CHECK ==="
+          - "Bitte f?hre diese Befehle auf deinem Client-System aus (nicht auf dem Server):"
+          - ""
+          - "1. Pr?fe aktive DNS-Server:"
+          - "   Linux/Mac: cat /etc/resolv.conf"
+          - "   Windows: Get-DnsClientServerAddress | Select-Object InterfaceAlias, ServerAddresses"
+          - ""
+          - "2. Teste DNS-Aufl?sung:"
+          - "   dig +short grafana.michaelschiemer.de"
+          - "   Oder: nslookup grafana.michaelschiemer.de"
+          - ""
+          - "3. Teste DNS-Aufl?sung ?ber VPN-DNS:"
+          - "   dig +short grafana.michaelschiemer.de @10.8.0.1"
+          - "   Sollte zur?ckgeben: 10.8.0.1"
+          - ""
+          - "4. Pr?fe WireGuard Config:"
+          - "   ?ffne deine WireGuard-Config und pr?fe:"
+          - "   [Interface]"
+          - "   DNS = 10.8.0.1"
+          - ""
+          - "Teile mir die Ergebnisse mit, dann kann ich dir helfen, das zu fixen!"
+
+    - name: Check server-side WireGuard configuration
+      shell: |
+        echo "=== Server-Side WireGuard Config ==="
+        sudo cat /etc/wireguard/wg0.conf | grep -A 5 "\[Interface\]" | head -10
+      args:
+        executable: /bin/bash
+      register: wg_server_config
+      ignore_errors: yes
+      failed_when: false
+
+    - name: Display server-side WireGuard config
+      debug:
+        msg: "{{ wg_server_config.stdout_lines }}"
+
+    - name: Check server-side DNS resolution
+      shell: |
+        echo "=== Server-Side DNS Tests ==="
+        echo "1. Grafana via VPN DNS (10.8.0.1):"
+        dig +short grafana.michaelschiemer.de @10.8.0.1 2>&1 || echo "Failed"
+        echo ""
+        echo "2. Grafana via public DNS (8.8.8.8):"
+        dig +short grafana.michaelschiemer.de @8.8.8.8 2>&1 || echo "Failed"
+      args:
+        executable: /bin/bash
+      register: server_dns
+      ignore_errors: yes
+      failed_when: false
+
+    - name: Display server-side DNS tests
+      debug:
+        msg: "{{ server_dns.stdout_lines }}"