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/Cargo.lock

@@ -448,10 +448,9 @@ dependencies = [
 ]
 
 [[package]]
-name = "claude-app"
-version = "1.0.0"
+name = "claudify"
+version = "0.1.0"
 dependencies = [
- "gtk",
  "serde",
  "serde_json",
  "tauri",