feat: implement DiabetesClassifier with full pipeline

notebook: complete insurance data analysis

feat: implement LinearRegression with OLS and GD methods

update python/README.md

Merge remote-tracking branch 'origin/develop' into develop

docs: add screenshot of client logs

update python/README.md

update python/src/client.py

feat: implement resilience patterns (timeout, retry, circuit breaker)

fix: datetime comparison in event validation

fix: correct recurrence rule validation in event dialog

fix: correct recurrence rule data format for Django serializer

fix: recurrence data validation and event creation