Add WireGuard TUI implementation

- Add Go TUI with bubbletea for WireGuard management
- Implement client CRUD operations with QR code generation
- Add configuration and validation modules
- Install/update scripts for client setup
- Update Makefile to build binaries to bin/ directory
- Add .gitignore for Go projects

.gitignore

@@ -0,0 +1,27 @@
+# Binaries
+bin/
+*.exe
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool
+*.out
+coverage.html
+
+# Go workspace file
+go.work
+
+# IDE specific
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS specific
+.DS_Store
+Thumbs.db