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.

backend/api/v1/modules/public/payment_methods/models.py

@@ -0,0 +1,16 @@
+from sqlalchemy import String, PrimaryKeyConstraint
+from sqlalchemy.orm import mapped_column, Mapped
+from core.database import Base
+
+class PaymentMethod(Base):
+    __tablename__ = "payment_methods" #GFormaPago
+    __table_args__ = (
+        PrimaryKeyConstraint("key", name="payment_methods_pkey"),
+        {"schema": "public"}  # opcional
+    )
+
+    key: Mapped[str] = mapped_column(String(2), nullable=False)
+    description: Mapped[str] = mapped_column(String(100), nullable=False)
+
+    def __repr__(self):
+        return f"<PaymentMethod(key={self.key}, description={self.description})>"