Rename to claudify, add docs and .deb packaging

- Rename package from claude-app to claudify (v0.1.0)
- Add README.md with install/usage instructions
- Add CLAUDE.md with architecture, build, and known issues
- Add .desktop file for application menu integration
- Build target set to .deb only
- Remove failed CSD button workarounds, document upstream bug
- Remove gtk dependency (no longer needed)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src-tauri/claudify.desktop

@@ -0,0 +1,9 @@
+[Desktop Entry]
+Categories=Network;WebBrowser;
+Comment=Native desktop wrapper for claude.ai
+Exec=claudify
+Icon=claudify
+Keywords=claude;ai;anthropic;chat;
+Name=Claudify
+Terminal=false
+Type=Application