refactor: restructure test suite

- Remove tests/production/ directory (JWT auth, production monitoring, etc.)
- Remove tests/staking/ directory
- Remove tests/services/test_staking_service.py
- Remove tests/phase1/ directory
- Remove tests/load_test.py
- Add tests/verification/ directory with 20+ new test files
- Add tests/load/locustfile.py for load testing
- Add tests/security/test_confidential_transactions.py
- Add tests/integration/test_working_integration.py
- Update docs/ for minimum Python version and paths

tests/verification/test_tx_model.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+"""
+Test the Transaction model directly
+"""
+
+# Test creating a transaction model instance
+tx_data = {
+    "tx_hash": "0xtest123",
+    "sender": "0xsender",
+    "recipient": "0xrecipient",
+    "payload": {"test": "data"}
+}
+
+print("Transaction data:")
+print(tx_data)
+
+# Simulate what the router does
+print("\nExtracting fields:")
+print(f"tx_hash: {tx_data.get('tx_hash')}")
+print(f"sender: {tx_data.get('sender')}")
+print(f"recipient: {tx_data.get('recipient')}")