feat: Initial commit - Train tracking system

Complete real-time train tracking system for Spanish railways (Renfe/Cercanías):

- Backend API (Node.js/Express) with GTFS-RT polling workers
- Frontend dashboard (React/Vite) with Leaflet maps
- Real-time updates via Socket.io WebSocket
- PostgreSQL/PostGIS database with Flyway migrations
- Redis caching layer
- Docker Compose configuration for development and production
- Gitea CI/CD workflows (lint, auto-tag, release)
- Production deployment with nginx + Let's Encrypt SSL

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.env.testing

@@ -0,0 +1,37 @@
+# ============================================
+# Configuración de Testing del Sistema de Tracking de Trenes
+# ============================================
+# Este archivo se usa para el entorno de testing/pruebas
+# No contiene datos sensibles ya que es solo para testing
+
+# --- Base de Datos PostgreSQL ---
+POSTGRES_PASSWORD=test_password_not_secure
+
+# --- Redis ---
+REDIS_PASSWORD=test_redis_password
+
+# --- Backend API ---
+JWT_SECRET=test_jwt_secret_for_testing_only_min_32_chars_12345
+CORS_ORIGIN=http://localhost:80,http://localhost:3000,http://localhost:5173
+LOG_LEVEL=debug
+
+# --- Frontend ---
+VITE_API_URL=http://localhost/api
+VITE_WS_URL=ws://localhost/ws
+
+# --- Worker ---
+# URL del feed GTFS-RT de Renfe
+GTFS_RT_URL=https://gtfsrt.renfe.com/vehicle_positions.pb
+# Intervalo de polling más rápido para testing (15 segundos)
+POLLING_INTERVAL=15000
+
+# --- Configuración de Entorno ---
+NODE_ENV=development
+
+# --- Flags de Testing ---
+# Generar datos de prueba automáticamente
+GENERATE_TEST_DATA=true
+# Habilitar endpoints de debug
+ENABLE_DEBUG_ENDPOINTS=true
+# Deshabilitar rate limiting para pruebas
+DISABLE_RATE_LIMIT=true