feat: Convert to Reference Link

[eli64s]

Add Markdown Reference Link Converter

Overview

Add feature to convert all inline Markdown links in a given file to reference-style links, making Markdown files more maintainable and readable. This adds a new reflinks command to the CLI that can process single files or entire directories.

Key Changes

• Add new ReflinkConverter class in utils/reference_links.py
• Add new CLI command reflinks for converting markdown links

New Features

• Convert inline Markdown links to reference-style links
• Handle both regular links and image links
• Generate unique reference IDs automatically
• Preserve original content structure
• Option to modify files in place or save to new location

Usage Examples

# Convert links in a file (modifies in place)
splitme-ai --reflinks.input README.md

# Convert links and save to a new file
splitme-ai --reflinks.i README.md --reflinks.o README-with-refs.md

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