Fix Dockerfile static copy, dynamic port, health endpoint

- Remove COPY static/ (runtime uploads live in DATA_DIR/uploads)
- Add /health endpoint
- Read PORT from env (NOMAD_PORT_http in production, 9756 local)
- citti.nomad: dynamic port, canary deploy, Consul/Traefik, health check

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app.py

@@ -191,6 +191,11 @@ def serve_upload(filename):
     return send_from_directory(UPLOAD_DIR, filename)
 
 
+@app.route('/health')
+def health():
+    return jsonify({'status': 'healthy', 'service': 'citti'})
+
+
 @app.route('/api/category', methods=['POST'])
 def add_category():
     d = request.json
@@ -255,6 +260,7 @@ def analyse():
 
 if __name__ == '__main__':
     init_db()
+    port = int(os.environ.get('PORT', 9756))
     try:
         s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
         s.connect(("8.8.8.8", 80))
@@ -262,6 +268,6 @@ if __name__ == '__main__':
         s.close()
     except Exception:
         local_ip = "127.0.0.1"
-    print(f"\n  Computer: http://localhost:9756")
-    print(f"  Telefon (samme WiFi): http://{local_ip}:9756\n")
-    app.run(host='0.0.0.0', port=9756, debug=False)
+    print(f"\n  Computer: http://localhost:{port}")
+    print(f"  Telefon (samme WiFi): http://{local_ip}:{port}\n")
+    app.run(host='0.0.0.0', port=port, debug=False)