chore: add .editorconfig for consistent coding style

[yosoyjhork]

This adds an .editorconfig file to ensure consistent indentation and line endings across different IDEs and contributors.

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Note

Introduces repository-wide EditorConfig to standardize formatting across editors.

• Adds root .editorconfig with end_of_line=lf, insert_final_newline=true, charset=utf-8
• Sets default indent_style=space and indent_size=4
• Overrides *.{yml,yaml,json} to indent_size=2
• Sets Makefile to indent_style=tab

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