Add feature for use of local font

[Code0ut]

Feature: Local Font Support with Priority-Based Loading

Short Summary

This PR adds robust local font loading support and updates the font selection priority system.

New priority order:

1. Google Fonts (--font-family)
2. Local font path (--font-path)
3. Default local Roboto fallback

It also introduces CLI support and documentation for using local fonts.

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Fixes

• [FR] Use of local font #163

What I Changed

Font Loading Enhancements

• Added load_fonts_from_path() in font_management.py

  • Supports:
    • Single font files and directories
    • Pattern matching for bold/regular/light (including numeric weights)
    • ~ expansion
    • Absolute & relative paths (Windows + Unix)
    • .ttf, .otf, .woff, .woff2 formats

• Added local_FONT_LOADING.md ( user guide for using local fonts )

• Updated load_fonts() signature:

load_fonts(font_family=None, font_path=None)