feat: Add Prometheus installation role and playbook

- Created Prometheus role with automated installation
- Version: 2.48.1
- Configured remote_write to VictoriaMetrics (192.168.0.104:8428)
- Added scrape configs for monitoring infrastructure
- Created systemd service configuration
- Successfully tested on 192.168.0.105

roles/prometheus/templates/prometheus.yml.j2

@@ -0,0 +1,80 @@
+# Ansible managed - do not edit manually
+global:
+  scrape_interval: 15s
+  evaluation_interval: 15s
+  external_labels:
+    monitor: 'pve-monitoring'
+    environment: 'production'
+    prometheus_replica: '{{ ansible_hostname }}'
+
+# Alertmanager configuration (optional)
+alerting:
+  alertmanagers:
+    - static_configs:
+        - targets: []
+
+# Load rules once and periodically evaluate them
+rule_files:
+  - "{{ prometheus_config_dir }}/rules/*.yml"
+
+# Remote write to VictoriaMetrics
+remote_write:
+  - url: "{{ victoriametrics_url }}"
+    queue_config:
+      max_samples_per_send: 10000
+      capacity: 20000
+      max_shards: 30
+    metadata_config:
+      send: true
+      send_interval: 1m
+
+# Scrape configurations
+scrape_configs:
+  # Prometheus self-monitoring
+  - job_name: 'prometheus'
+    static_configs:
+      - targets: ['localhost:{{ prometheus_port }}']
+        labels:
+          instance: 'prometheus'
+          container: 'pvestandt6'
+
+  # VictoriaMetrics monitoring
+  - job_name: 'victoriametrics'
+    static_configs:
+      - targets: ['{{ victoriametrics_host }}:{{ victoriametrics_port }}']
+        labels:
+          instance: 'victoriametrics'
+          container: 'pvestandt5'
+
+  # Vault metrics
+  - job_name: 'vault'
+    metrics_path: '/v1/sys/metrics'
+    params:
+      format: ['prometheus']
+    bearer_token: '{{ vault_token }}'
+    static_configs:
+      - targets: ['{{ vault_host }}:{{ vault_port }}']
+        labels:
+          instance: 'vault'
+          container: 'pvestandt4'
+
+  # Git/Forgejo metrics
+  - job_name: 'gitea'
+    metrics_path: '/metrics'
+    static_configs:
+      - targets: ['{{ git_host }}:{{ git_port }}']
+        labels:
+          instance: 'git'
+          container: 'pvestandt1'
+
+  # Node exporters - будем добавлять динамически
+  - job_name: 'node'
+    static_configs:
+{% if node_exporter_targets | length > 0 %}
+      - targets:
+{% for target in node_exporter_targets %}
+        - {{ target }}:9100
+{% endfor %}
+{% else %}
+      - targets: []  # Will be populated after installing node_exporter
+{% endif %}