🏗️ Architect: Auth Strategy Pattern Refactor

[fderuiter]

Refactored the authentication logic in imednet-python-sdk to use the Strategy Pattern.

• Auth Strategy: Created imednet/auth/strategy.py and imednet/auth/api_key.py.
• Dependency Injection: Updated BaseClient and HTTPClientBase to accept an auth strategy, while maintaining backward compatibility.
• SDK Update: Updated ImednetSDK to use ApiKeyAuth explicitly.
• Documentation: Added .jules/architect.md to document the decision.

This change allows for easier extension of authentication methods (e.g., adding OAuth) and improves testability.

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PR created automatically by Jules for task 6663660649453286810 started by @fderuiter

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