Rewrite maifetch in NASM assembly

[alejandrorivas-pixel]

/claim #1

Summary

• Replaces the Go module with a Linux x86-64 NASM implementation.
• Keeps config/env/CLI precedence for token, logo size, score count, and config file.
• Supports fixture-driven validation plus curl-backed MaiTea profile/play requests for live use.
• Adds a NASM/GCC fixture test and GitHub Actions workflow.

Validation

• nasm -f elf64 src/maifetch.asm -o /tmp/maifetch.o
• git diff --check
• Fork GitHub Actions NASM fixture: https://github.com/alejandrorivas-pixel/maifetch/actions/runs/27572801945

payment details can be provided privately after maintainer acceptance.