feat: add auto-generated problems list

[mathusanm6]

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[Copilot]

Pull Request Overview

This PR adds an automated README generation system that creates the problems table from individual problem configuration files. This replaces the manual maintenance of the README with a data-driven approach.

• Implements a Python script that scans problem directories for YAML configuration files and generates the README table automatically
• Adds configuration files for problem difficulties and algorithm tags to validate problem data
• Updates the Makefile with targets for README generation and validation

Reviewed Changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
scripts/generate_readme.py	Core README generator that parses problem configs and rebuilds the algorithms section
problems/*/config.yml	YAML configuration files defining problem metadata, solutions, and complexity
config/tags.yml	Defines valid algorithm tags for problem categorization
config/difficulties.yml	Defines valid difficulty levels (easy, medium, hard)
README.md	Updated with auto-generated problems table organized by algorithm tags
Makefile	Added targets for README generation and validation checks

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