feat(risk): implement shipment risk scoring system

[Ibinola]

This PR introduces a new module dedicated to calculating risk scores for shipments. The system provides a quantitative measure of risk by analyzing several key factors, allowing for better decision-making in logistics.

Key Changes:

• RiskModule: A new module that encapsulates all risk assessment logic.
• RiskService: Contains the core scoring engine. It uses a configurable weighted model to assess risks from different factors:
• Cargo Type: Assigns higher risk to hazardous or perishable goods.
• Route & Geopolitical: Evaluates risk based on predefined high-risk origins or destinations.
• Carrier Reliability: Simulates a lookup for carrier performance history.
• RiskController: Exposes a POST /risk/score endpoint that accepts shipment details and returns a calculated score along with a breakdown of contributing factors.

CalculateRiskDto: Ensures that all incoming data for risk calculation is valid and properly structured.

Closes #321

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