Add automated .env file creation for monitoring stack via Ansible

- Add Jinja2 template for monitoring stack .env file
- Add Ansible tasks to generate passwords and create .env automatically
- Update vault example with monitoring credentials
- Remove manual deploy.sh script (using Ansible instead)
- Add app-internal network creation task

deployment/ansible/templates/monitoring.env.j2

@@ -0,0 +1,20 @@
+# Monitoring Stack Environment Configuration
+# Generated by Ansible - DO NOT EDIT MANUALLY
+
+# Domain Configuration
+DOMAIN={{ app_domain | default('michaelschiemer.de') }}
+
+# Grafana Configuration
+GRAFANA_ADMIN_USER={{ grafana_admin_user | default('admin') }}
+GRAFANA_ADMIN_PASSWORD={{ grafana_admin_password }}
+
+# Grafana Plugins (comma-separated)
+# Common useful plugins:
+# - grafana-clock-panel
+# - grafana-piechart-panel
+# - grafana-worldmap-panel
+GRAFANA_PLUGINS={{ grafana_plugins | default('') }}
+
+# Prometheus BasicAuth
+# Format: username:hashed_password
+PROMETHEUS_AUTH={{ prometheus_auth }}