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>

package.json

@@ -1,6 +1,6 @@
 {
-  "name": "claude-app",
-  "version": "1.0.0",
+  "name": "claudify",
+  "version": "0.1.0",
   "private": true,
-  "description": "Claude desktop app"
+  "description": "Native desktop wrapper for claude.ai"
 }