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-app-entrypoint.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+set -e
+
+echo "=========================================="
+echo "PostgreSQL App - Inicialización"
+echo "=========================================="
+
+# Este script es ejecutado por docker-entrypoint-initdb.d
+# PostgreSQL ya está iniciado por el contenedor padre
+
+echo "✓ PostgreSQL está listo (iniciado por contenedor)"
+
+# La base de datos anexo76_core ya está creada por POSTGRES_DB
+echo "✓ Base de datos 'anexo76_core' ya configurada"
+
+# Crear extensiones y esquemas
+echo "Creando extensiones y esquemas..."
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+    CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
+    CREATE EXTENSION IF NOT EXISTS "pg_trgm";
+    CREATE SCHEMA IF NOT EXISTS a76;
+    CREATE SCHEMA IF NOT EXISTS a22;
+    CREATE SCHEMA IF NOT EXISTS a24;
+    CREATE SCHEMA IF NOT EXISTS a31;
+EOSQL
+
+echo "✓ Extensiones y esquemas creados correctamente"
+echo "=========================================="
+echo "PostgreSQL App - Inicialización completada"
+echo "=========================================="