feat: implement complete CMT backend with API endpoints and test suite

- Add 7 core API endpoints: users, transactions, partners, products, inventory, payments, credit
- Implement role-based authentication (admin/write/read-only access)
- Add comprehensive database models with proper relationships
- Include full test coverage for all endpoints and business logic
- Set up Alembic migrations and Docker configuration
- Configure FastAPI app with CORS and database integration

backend/test_config.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+"""
+Simple script to test if environment variables are being read correctly.
+"""
+import os
+import sys
+sys.path.append('.')
+
+from app.core.config import settings
+
+print("Testing environment variable loading...")
+print(f"Environment: {settings.environment}")
+print(f"Project Name: {settings.project_name}")
+print(f"Database URI: {settings.database_uri}")
+print(f"Secret Key: {settings.secret_key[:20]}..." if len(settings.secret_key) > 20 else settings.secret_key)
+print(f"Admin Token Expire Minutes: {settings.admin_token_expire_minutes}")
+print(f"Write Token Expire Minutes: {settings.write_token_expire_minutes}")
+print(f"Read Only Token Expire Minutes: {settings.read_only_token_expire_minutes}")
+
+print("\nDirect environment check:")
+print(f"SECRET_KEY from env: {os.getenv('SECRET_KEY', 'NOT_FOUND')[:20]}...")
+print(f"ADMIN_TOKEN_EXPIRE_MINUTES from env: {os.getenv('ADMIN_TOKEN_EXPIRE_MINUTES', 'NOT_FOUND')}")
+print(f"WRITE_TOKEN_EXPIRE_MINUTES from env: {os.getenv('WRITE_TOKEN_EXPIRE_MINUTES', 'NOT_FOUND')}")
+print(f"READ_ONLY_TOKEN_EXPIRE_MINUTES from env: {os.getenv('READ_ONLY_TOKEN_EXPIRE_MINUTES', 'NOT_FOUND')}")