Add SDK telemetry headers (v1.4.1)

- Add X-Api-Client header: 'oilpriceapi-python'
- Add X-Client-Version header: '1.4.1'
- Update User-Agent to include Python version
- Remove deprecated X-SDK-Language, X-SDK-Version, X-Client-Type headers

Resolves: #8
Documentation: /home/kwaldman/code/sdks/EISENHOWER_MATRIX_PLAN.md

Release v1.4.0: Price Alerts Support

Release v1.0.0 - Production-ready Python SDK

First stable release of the OilPriceAPI Python SDK.

Features:
- Synchronous and asynchronous clients
- Comprehensive error handling with retry logic
- Type-safe models with Pydantic v2
- Current and historical price data access
- Optional pandas DataFrame support
- Production logging and observability
- 100 passing tests with 64% coverage
- Full documentation and examples

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