Major refactor: lossless bit pipeline, output organization, and cross-platform installer

[sssamuelll]

Summary

This PR introduces major improvements to TubeStore's core functionality and structure.

• Lossless Conversion: Fixed bit-level encoding/decoding (0/1 array logic)
• MJPG Codec: Switched to visually lossless .avi for reliable data recovery
• Output Organization: All generated files now stored under /output/videos and /output/recovered
• Cross-Platform Installer: Improved install.sh with venv creation and auto-launch
• File Dialog: Added native tkinter file selection for Windows, macOS, and Linux
• Code Cleanup: Added comments, modularized helpers, cleaned print output

Why

These changes make TubeStore a production-ready tool that runs seamlessly on all major platforms with a clean structure and a professional user experience.

Testing

• ✅ Verified with .txt, .pdf, and .jpg files (SHA256 identical after roundtrip)
• ✅ Tested on macOS and Linux
• ✅ MJPG .avi output fully recoverable
• ✅ install.sh installs, aliases, and launches correctly

Future work

• Add integrity hash verification (auto)
• Remember last directory in file dialog
• Optional redundancy for lossy codecs (e.g., YouTube uploads)