Add hit counter service and expand frontend content sections

- New hit-counter FastAPI service (Prometheus metrics, SQLite storage), wired into Caddy (hits.carloselugo.com) and docker-compose
- Scrape hit-counter in Prometheus every 5m
- Add articles, about, contact, experience, and expertise sections to the frontend, with per-article hit tracking

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docker-compose.yml

@@ -13,6 +13,7 @@ services:
       - caddy_data:/data
       - caddy_config:/config
       - caddy_logs:/var/log/caddy
+      - /opt/void/frontend:/srv/void:ro
     networks:
       - web-net
     depends_on:
@@ -208,6 +209,16 @@ services:
   #   sysctls:
   #     - net.ipv6.conf.all.disable_ipv6=1
 
+  # ─── Hit Counter ───────────────────────────────────────────────────────────
+  hit-counter:
+    build: ./hit-counter
+    container_name: hit-counter
+    restart: unless-stopped
+    volumes:
+      - hit_counter_data:/data
+    networks:
+      - web-net
+
 volumes:
   caddy_data:
   caddy_config:
@@ -218,6 +229,7 @@ volumes:
   portainer_data:
   prometheus_data:
   grafana_data:
+  hit_counter_data:
   # umami_db_data:
 
 networks: