feat: Initialize SQLAlchemy backend and database structure

- Added SQLAlchemy initialization script for backend setup.
- Created SQLAlchemy prompts for generating database models with LLMs.
- Introduced Docker Compose configuration for PostgreSQL service.
- Added SQL script to enable necessary PostgreSQL extensions.

docker-entrypoint-initdb.d/10-extensions.sql

@@ -0,0 +1,7 @@
+-- Habilitar extensiones solicitadas
+CREATE EXTENSION IF NOT EXISTS hstore;
+CREATE EXTENSION IF NOT EXISTS citext;
+CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
+CREATE EXTENSION IF NOT EXISTS pg_trgm;
+CREATE EXTENSION IF NOT EXISTS postgis;
+CREATE EXTENSION IF NOT EXISTS vector;