🏦 Create Treasury Protection Policies

# 🧠 Concept
Allow organizations to define treasury safety rules.

## ⚠️ Problem
Treasury movements often require special monitoring.

## 📁 Implementation Scope
- src/modules/treasury/policies/

## ✅ Requirements
- Policy configuration
- Threshold definitions
- Alert integration

## 🎯 Acceptance Criteria
- [ ] Policies configurable
- [ ] Violations detected
- [ ] Alerts generated