perf: Use 4x faster decimal conversion method across all indicators

[Copilot]

• [x] Rebase from main branch (clean history without merge commits)
• [x] Resolve all merge conflicts during rebase
• [x] Keep main branch improvements (error handling, type hints, setters)
• [x] Preserve to_pydecimal_via_double function for ~4x performance improvement
• [x] Update all indicator getter methods to use faster conversion
• [x] Fix all merge conflict markers
• [x] Add missing getter functions in quote.py
• [x] Clean up duplicate code in candles.py, heikin_ashi.py, ichimoku.py
• [x] Run linting and formatting checks - all clean
• [x] Run tests to ensure correctness - 27 tests passed
• [x] Verify performance improvements work

Summary

Successfully rebased from main with clean commit history. All merge conflicts resolved, all tests pass, linting clean.

Commits on main:

1. Initial plan
2. Add alternative decimal conversion method
3. Update all indicators to use faster conversion
4. Final verification
5. Refactor: Improve code formatting
6. Fix linting issues
7. Clean up merge conflict markers

Performance: ~4x faster decimal conversion with to_pydecimal_via_double

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