feat: homelab deployment - NPM + IONOS DNS + monitoring + NAS backup

- Restructured docker-compose for Nginx Proxy Manager (no custom nginx)
- Added domain wordly.art configuration
- Added Prometheus + Grafana monitoring stack with pre-configured dashboards
- Added PostgreSQL backup script to NAS (daily/weekly/monthly rotation)
- Added alert rules for backend, system, and Docker metrics
- Updated deployment guide for NPM + IONOS DNS homelab setup
- Added marketing plan document
- PDF translator and watermark support
- Enhanced middleware, routes, and translator modules

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

docker/prometheus/alerts.yml

@@ -0,0 +1,101 @@
+# Wordly.art - Prometheus Alert Rules
+
+groups:
+  # Application alerts
+  - name: wordly_app
+    rules:
+      - alert: BackendDown
+        expr: up{job="wordly-backend"} == 0
+        for: 2m
+        labels:
+          severity: critical
+        annotations:
+          summary: "Wordly backend is down"
+          description: "Backend has been down for more than 2 minutes."
+
+      - alert: HighErrorRate
+        expr: rate(http_requests_total{status=~"5.."}[5m]) / rate(http_requests_total[5m]) > 0.1
+        for: 5m
+        labels:
+          severity: warning
+        annotations:
+          summary: "High error rate detected"
+          description: "More than 10% of requests are returning 5xx errors."
+
+      - alert: SlowTranslations
+        expr: histogram_quantile(0.95, rate(translation_duration_seconds_bucket[5m])) > 120
+        for: 10m
+        labels:
+          severity: warning
+        annotations:
+          summary: "Translations are slow"
+          description: "95th percentile translation time is over 120 seconds."
+
+      - alert: HighTranslationQueue
+        expr: translation_queue_size > 20
+        for: 5m
+        labels:
+          severity: warning
+        annotations:
+          summary: "Translation queue is backing up"
+          description: "More than 20 translations queued."
+
+  # System alerts
+  - name: wordly_system
+    rules:
+      - alert: HighMemoryUsage
+        expr: (node_memory_MemTotal_bytes - node_memory_MemAvailable_bytes) / node_memory_MemTotal_bytes > 0.9
+        for: 5m
+        labels:
+          severity: warning
+        annotations:
+          summary: "High memory usage"
+          description: "Server memory usage is above 90%."
+
+      - alert: DiskSpaceLow
+        expr: (node_filesystem_avail_bytes{mountpoint="/"} / node_filesystem_size_bytes{mountpoint="/"}) < 0.15
+        for: 10m
+        labels:
+          severity: warning
+        annotations:
+          summary: "Low disk space"
+          description: "Less than 15% disk space remaining on /."
+
+      - alert: DiskSpaceCritical
+        expr: (node_filesystem_avail_bytes{mountpoint="/"} / node_filesystem_size_bytes{mountpoint="/"}) < 0.05
+        for: 5m
+        labels:
+          severity: critical
+        annotations:
+          summary: "Critical disk space"
+          description: "Less than 5% disk space remaining on /."
+
+      - alert: HighCPUUsage
+        expr: 100 - (avg by(instance) (rate(node_cpu_seconds_total{mode="idle"}[5m])) * 100) > 85
+        for: 10m
+        labels:
+          severity: warning
+        annotations:
+          summary: "High CPU usage"
+          description: "CPU usage is above 85% for 10 minutes."
+
+  # Docker alerts
+  - name: wordly_docker
+    rules:
+      - alert: ContainerRestarted
+        expr: increase(container_restart_count[1h]) > 2
+        for: 5m
+        labels:
+          severity: warning
+        annotations:
+          summary: "Container restarting"
+          description: "Container {{ $labels.name }} has restarted more than 2 times in the last hour."
+
+      - alert: ContainerOOM
+        expr: increase(container_oom_events_total[1h]) > 0
+        for: 1m
+        labels:
+          severity: critical
+        annotations:
+          summary: "Container OOM killed"
+          description: "Container {{ $labels.name }} was OOM killed."

docker/prometheus/prometheus.yml

@@ -1,37 +1,34 @@
-# Prometheus Configuration for Document Translation API
+# Wordly.art - Prometheus Configuration
 
 global:
   scrape_interval: 15s
   evaluation_interval: 15s
   external_labels:
-    monitor: 'translate-api'
+    monitor: 'wordly-homelab'
+    environment: 'production'
 
-alerting:
-  alertmanagers:
-    - static_configs:
-        - targets: []
-
-rule_files: []
+rule_files:
+  - 'alerts.yml'
 
 scrape_configs:
-  # Backend API metrics
-  - job_name: 'translate-backend'
+  # Backend FastAPI
+  - job_name: 'wordly-backend'
     static_configs:
       - targets: ['backend:8000']
     metrics_path: /metrics
     scrape_interval: 10s
 
-  # Nginx metrics (requires nginx-prometheus-exporter)
-  - job_name: 'nginx'
-    static_configs:
-      - targets: ['nginx-exporter:9113']
-
-  # Node exporter for system metrics
+  # Systeme (CPU, RAM, Disk, Reseau)
   - job_name: 'node'
     static_configs:
       - targets: ['node-exporter:9100']
 
-  # Docker metrics
+  # Containers Docker
   - job_name: 'docker'
     static_configs:
       - targets: ['cadvisor:8080']
+
+  # Prometheus lui-meme
+  - job_name: 'prometheus'
+    static_configs:
+      - targets: ['localhost:9090']