Remove build artifacts from repository and improve Debian package installation

- Remove debian/usr/bin/beast-dump from git tracking (build artifact)
- Add debian/usr/bin/* to .gitignore to prevent future binary commits
- Update postinst script for quiet installation:
  - Add --quiet flags to adduser/addgroup commands
  - Suppress output from directory creation and permission setting
  - Smart service handling: restart if enabled, leave disabled otherwise
  - Remove verbose installation messages
- Binaries are now built only during package creation, not stored in repo

🤖 Generated with [Claude Code](https://claude.ai/code)

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

.gitignore

@@ -3,6 +3,10 @@ skyview
 build/
 dist/
 
+# Debian package build artifacts
+debian/usr/bin/skyview
+debian/usr/bin/beast-dump
+
 # Configuration
 config.json