docs: Add comprehensive technical documentation in Korean

[gurupia]

• Project architecture design document
• Feature specification document
• Technology stack documentation
• Build environment setup guide
• Core technology implementation details
• E-book format consolidated documentation

[github-actions]

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[dmex]

1. The CLA needs to be signed.
2. Is this AI generated?
3. Based on common open-source, industry, and Git best practices; All comments, issues, pull request titles, descriptions, code comments, readme files, and documentation are in English.

This keeps the entire project consistent; a single language ensures that contributors from different backgrounds can understand and participate. It also ensures everyone references the same information when it's changed or updated.

I can add the files in this PR to the project website (https://systeminformer.sourceforge.io/) instead of the repository? The website has significantly more traffic than the source repo and more suited for translated documents.