feat: Ajout monitoring Prometheus/Grafana et configuration déploiement serveur Linux

- Ajout Prometheus et Grafana au docker-compose.yml
- Métriques automatiques pour le backend FastAPI
- Configuration de production avec docker-compose.prod.yml
- Guide de déploiement manuel pour serveur Linux
- Variables d'environnement sécurisées
- Documentation complète de déploiement

monitoring/grafana/dashboards/dockezr-overview.json

@@ -0,0 +1,98 @@
+{
+  "dashboard": {
+    "id": null,
+    "title": "Dockezr - Vue d'ensemble",
+    "tags": ["dockezr", "monitoring"],
+    "style": "dark",
+    "timezone": "browser",
+    "panels": [
+      {
+        "id": 1,
+        "title": "État des services",
+        "type": "stat",
+        "targets": [
+          {
+            "expr": "up{job=\"dockezr-backend\"}",
+            "legendFormat": "Backend FastAPI"
+          },
+          {
+            "expr": "up{job=\"dockezr-frontend\"}",
+            "legendFormat": "Frontend Next.js"
+          },
+          {
+            "expr": "up{job=\"dockezr-database\"}",
+            "legendFormat": "Base de données"
+          }
+        ],
+        "fieldConfig": {
+          "defaults": {
+            "color": {
+              "mode": "thresholds"
+            },
+            "thresholds": {
+              "steps": [
+                {
+                  "color": "red",
+                  "value": 0
+                },
+                {
+                  "color": "green",
+                  "value": 1
+                }
+              ]
+            }
+          }
+        },
+        "gridPos": {
+          "h": 8,
+          "w": 12,
+          "x": 0,
+          "y": 0
+        }
+      },
+      {
+        "id": 2,
+        "title": "Requêtes par seconde - Backend",
+        "type": "graph",
+        "targets": [
+          {
+            "expr": "rate(http_requests_total{job=\"dockezr-backend\"}[5m])",
+            "legendFormat": "RPS"
+          }
+        ],
+        "gridPos": {
+          "h": 8,
+          "w": 12,
+          "x": 12,
+          "y": 0
+        }
+      },
+      {
+        "id": 3,
+        "title": "Temps de réponse - Backend",
+        "type": "graph",
+        "targets": [
+          {
+            "expr": "histogram_quantile(0.95, rate(http_request_duration_seconds_bucket{job=\"dockezr-backend\"}[5m]))",
+            "legendFormat": "95th percentile"
+          },
+          {
+            "expr": "histogram_quantile(0.50, rate(http_request_duration_seconds_bucket{job=\"dockezr-backend\"}[5m]))",
+            "legendFormat": "50th percentile"
+          }
+        ],
+        "gridPos": {
+          "h": 8,
+          "w": 24,
+          "x": 0,
+          "y": 8
+        }
+      }
+    ],
+    "time": {
+      "from": "now-1h",
+      "to": "now"
+    },
+    "refresh": "30s"
+  }
+}

monitoring/grafana/provisioning/dashboards/dashboard.yml

@@ -0,0 +1,12 @@
+apiVersion: 1
+
+providers:
+  - name: 'default'
+    orgId: 1
+    folder: ''
+    type: file
+    disableDeletion: false
+    updateIntervalSeconds: 10
+    allowUiUpdates: true
+    options:
+      path: /var/lib/grafana/dashboards

monitoring/grafana/provisioning/datasources/prometheus.yml

@@ -0,0 +1,9 @@
+apiVersion: 1
+
+datasources:
+  - name: Prometheus
+    type: prometheus
+    access: proxy
+    url: http://prometheus:9090
+    isDefault: true
+    editable: true

monitoring/prometheus.yml

@@ -0,0 +1,39 @@
+global:
+  scrape_interval: 15s
+  evaluation_interval: 15s
+
+rule_files:
+  # - "first_rules.yml"
+  # - "second_rules.yml"
+
+scrape_configs:
+  # Prometheus lui-même
+  - job_name: 'prometheus'
+    static_configs:
+      - targets: ['localhost:9090']
+
+  # Backend FastAPI avec métriques
+  - job_name: 'dockezr-backend'
+    static_configs:
+      - targets: ['backend:8000']
+    metrics_path: '/metrics'
+    scrape_interval: 10s
+    scrape_timeout: 5s
+
+  # Base de données PostgreSQL (via postgres_exporter si ajouté)
+  - job_name: 'dockezr-database'
+    static_configs:
+      - targets: ['db:5432']
+    scrape_interval: 30s
+
+  # Frontend Next.js (métriques de base)
+  - job_name: 'dockezr-frontend'
+    static_configs:
+      - targets: ['frontend:3000']
+    scrape_interval: 30s
+
+  # Node Exporter pour métriques système (optionnel)
+  - job_name: 'node-exporter'
+    static_configs:
+      - targets: ['node-exporter:9100']
+    scrape_interval: 15s