feat: add Wine Z: path prefix for Windows platform on Linux host

- Add winePath helper that prepends Z: when platform is windows on Linux
- Thread platform through buildModPath, buildAutoArgs, and Start()
- Apply Z: prefix to -config=, -mod=, -profiles=, and %command% binary paths
- Add tests for winePath, buildAutoArgs, and buildModPath with platform param
- Fix formatting across services package with gofmt
- Include all prior bug fixes from this branch

PLAN.md

@@ -79,8 +79,7 @@ arma3-web-server/
 │   │   └── components/
 │   │       ├── ConfigEditor.tsx      # Monaco editor wrapper
 │   │       ├── LiveTerminal.tsx      # xterm.js + auto-reconnect WebSocket
-│   │       ├── Layout.tsx            # Sidebar nav shell
-│   │       └── ui/                   # (empty — reserved for future shared UI primitives)
+│   │       └── Layout.tsx            # Sidebar nav shell
 │   ├── package.json
 │   └── vite.config.ts               # Proxy /api + /ws to :8080
 ├── data/                            # Runtime data (mounted volume in Docker)