feat: P0 backup system (WAL+snapshot+restore+verify), monitoring stack, admin health API

monitoring/prometheus.yml

@@ -0,0 +1,33 @@
+global:
+  scrape_interval: 15s
+  evaluation_interval: 15s
+
+rule_files:
+  - /etc/prometheus/alerts.yml
+
+alerting:
+  alertmanagers:
+    - static_configs:
+        - targets: ['alertmanager:9093']
+
+scrape_configs:
+  - job_name: 'memento-app'
+    metrics_path: '/api/metrics'
+    static_configs:
+      - targets: ['memento-note:3000']
+
+  - job_name: 'node-exporter'
+    static_configs:
+      - targets: ['node-exporter:9100']
+
+  - job_name: 'postgres'
+    static_configs:
+      - targets: ['postgres-exporter:9187']
+
+  - job_name: 'redis'
+    static_configs:
+      - targets: ['redis-exporter:9121']
+
+  - job_name: 'cadvisor'
+    static_configs:
+      - targets: ['cadvisor:8080']