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

backend/internal/services/log_streamer.go

@@ -8,8 +8,8 @@ import (
 )
 
 type LogStreamer struct {
-	mu      sync.RWMutex
-	subs    map[string]map[string]chan string
+	mu   sync.RWMutex
+	subs map[string]map[string]chan string
 }
 
 func NewLogStreamer() *LogStreamer {