Create Portugal seismic data provider module

[nagcas]

Overview

Create a dedicated provider module for Portuguese seismic data.

The provider must be independent from existing earthquake sources.

Architecture

Example:

src/providers/

ingv/
usgs/
portugal/

Responsibilities

• Connect to Portuguese seismic data source
• Retrieve earthquake events
• Validate responses
• Convert data into TerraQuake standard format

Acceptance Criteria

• Portugal provider created
• Provider follows common interface
• Unit tests implemented