feat: Add frontend and backend initialization scripts, implement Keycloak and PostgreSQL setup

- Implemented SvelteKit frontend with authentication callback handling.
- Created demo routes and paraglide localization functionality.
- Added health check and entrypoint scripts for backend services.
- Established PostgreSQL and Keycloak initialization scripts with health checks.
- Introduced models for database schema using SQLAlchemy.
- Configured Vite and SvelteKit for development and testing environments.
- Added health check script to verify service statuses and resource usage.
- Created Docker entrypoint scripts for seamless service startup.

scripts/postgres-keycloak-entrypoint.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+set -e
+
+# Este script se ejecuta automáticamente en la primera inicialización de PostgreSQL
+# cuando se coloca en /docker-entrypoint-initdb.d/
+
+echo "Inicializando base de datos keycloak..."
+
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" <<-EOSQL
+    -- Verificar que la base de datos existe
+    SELECT 'Base de datos keycloak lista' AS status;
+EOSQL
+
+echo "✓ Base de datos keycloak inicializada correctamente"