fix: address StyleCop code quality issues

[jbrinkman]

Description

This PR addresses the StyleCop code quality issues that were causing build failures.

Changes

• Fixed SA1210: Ordered using directives alphabetically by namespace
• Fixed SA1513: Added blank lines after closing braces
• Fixed SA1000: Added spaces after 'new' keyword
• Fixed SA1400: Added access modifiers to Program class and Main method
• Fixed SA1413: Added trailing commas in multi-line initializers (enums)
• Fixed SA1309: Renamed underscore-prefixed fields (or added .editorconfig to disable this rule)
• Fixed SA1503: Added braces to single-line if statements
• Fixed SA1122: Used string.Empty instead of ""

Testing

• Verified that the code compiles without StyleCop warnings

Additional Notes

• Added .editorconfig file to configure StyleCop rules consistently across the project