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-compose.yml

@@ -0,0 +1,23 @@
+version: '3.8'
+services:
+  postgres_ext:
+    build:
+      context: .
+    restart: always
+    ports:
+    - 55432:5432
+    environment:
+      POSTGRES_PASSWORD: mipassword
+      POSTGRES_USER: postgres
+      POSTGRES_DB: basededatos
+    healthcheck:
+      test:
+      - CMD-SHELL
+      - pg_isready -U $${POSTGRES_USER} -d $${POSTGRES_DB}
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    volumes:
+    - postgres_data:/var/lib/postgresql/data
+volumes:
+  postgres_data: {}