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.

Dockerfile

@@ -0,0 +1,17 @@
+FROM postgres:15
+
+# Variables de entorno útiles
+ENV POSTGRES_USER=postgres \
+    POSTGRES_DB=basededatos
+
+RUN apt-get update && \
+DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+    gdal-bin \
+    postgresql-15-pgvector \
+    postgresql-15-postgis-3 \
+    postgresql-15-postgis-3-scripts \
+    proj-bin \
+&& rm -rf /var/lib/apt/lists/*
+
+# Copiamos scripts de inicialización
+COPY docker-entrypoint-initdb.d/ /docker-entrypoint-initdb.d/