Middleware Integration

[mo-jaber]

https://github.com/bsv-blockchain/py-middleware/milestone/5

Create seamless web framework integration

Tasks:

5.1 Implement middleware factory function (equivalent to
createAuthMiddleware)
5.2 Port authentication options and configuration
5.3 Handle authenticated vs unauthenticated request routing
5.4 Implement request decoration with auth context
5.5 Port error handling and response formatting
5.6 Add middleware chaining support